How to use Twilio to send appointment notification and reminder SMS in Zoho Bookings

How to use Twilio to send appointment notification and reminder SMS in Zoho Bookings

Hit no-shows out of the ballpark by combining Zoho Bookings and SMS providers.

SMS notifications help you remind customers of their appointments and reduce no-shows by reaching out where they are.

In this guide, we'll configure an SMS provider called Twilio.

Prerequisites

  • A Twilio Subscription
    • You need at least one number to send messages from. It can be a short code, your personal number, a local number, or anything else. Twilio charges monthly for phone numbers. Check out Twilio's pricing page for more details.
    • Since Twilio uses a pay-as-you-go model, there are no monthly commitments (except the sender number). The minimum recharge value is $20, and you can use it until the credits expire - Learn more about Twilio's pricing model here.

Things to Know Before Using Twilio

  • You can share your Twilio subscription amongst multiple admins (if required).
  • Twilio is responsible for everything except configuring SMS text (You can configure this inside Zoho Bookings).
  • Both single and dual way communication is possible with Twilio
  • Using Twilio, you can send messages across borders.
    • Case 1: When you send messages from a US number to an Indian number, sender IDs might change. It ensures the deliverability of messages.
    • Case 2: SenderIDs don't change when the sender and the recipient numbers belong to the same country.
  • Twilio charges for text messages on a segment basis. (1 segment = 160 Characters). For instance, if you send an SMS with 200 characters, you'll be charged for two SMS credits - Learn more about it here.
  • To find the number of SMS you'll be able to send with your top-up, use this formula:
    • Number of SMS that can be sent = (Top Up Value - Phone Number Price)/ Message Per SMS
    • Let's assume you belong to the US and recharge for $20. You've also opted for a long code that costs $1.16 (with carrier fees), the equation would look like
    • Number of SMS that can be sent* = ($20 - $1.16)/ ($0.0079) = 2200.
    • You'll be able to send approximately 2200+ SMS with this. (If you don't buy additional phone numbers in the US)
    • Note - The calculation is only an approximate estimation of the number of messages that you can send. This is because factors like carrier fees, and per-message rate change often and vary widely across different service providers.
  • Twilio credits are one-off amounts that don't expire until you use them.
  • Your Twilio account will get suspended once your account balance reaches zero. To avoid this, Twilio sends a notification to your email requesting you to refill your funds when the balance hits $5.
  • Another way to prevent your account from hitting zero you can set up an auto-recharge trigger for a minimum of $10. When your balance hits $10, you can automatically set it up to top up your account. Check out this page for setting up automatic payment triggers.
     

A2P 10 DLC Registration (only if you wish to send messages to the US)

Note - This is only necessary if you send messages to the United States. (Regardless of where you send your messages from - inside or outside the US)
  • If you send messages to the US, you should register for A2P 10 DLC. (Application to Person 10 Digit Long Code messaging protocol)
  • A2P 10DLC is a secure way to communicate with businesses and ensures that the messages are relevant to the recipients. We highly advise you to register for A2P 10 DLC Protocol as numbers without it will incur higher fees and even service disruptions from June 1, 2023. This is to comply with US messaging regulations. You can learn more about it here.
  • A2P 10 DLC registration is only possible with a Twilio premium subscription and not for trial accounts.
  • To do this, navigate to Phone Numbers > Manage > Active Numbers > Click on a Number.

  • Under Messaging Configuration, click on 'Go to 10DLC registration.'



Note - You cannot integrate multiple SMS providers to Zoho Bookings simultaneously.



Configuring Twilio with Zoho Bookings

1. Sign in to your Twilio account. (Sign up here if you don't have one)



2. You'll be redirected to the following screen once you've signed up. Check your mail inbox.


3. Your email would look like this. Confirm your account.



4. Twilio asks you to secure your account with a phone number. Enter your number and click on Send verification code/Get code via phone call depending on your choice.



5. Once you've confirmed your phone number you can fill in the onboarding form and click on get started with Twilio.



6. You'll be redirected to the Twilio dashboard.


  • 'My first Twilio account' is the account name of your Twilio SMS account. If you have multiple Twilio SMS accounts you can navigate it from here
  • The Phone numbers tab helps you to
    • Manage all your Phone numbers
    • Buy new Numbers
    • Release a Phone number
  • When you sign up for a Twilio account, you'll get $15.50. You can get a trial number using this to test their configurations before opting for a premium plan.
7. Let's get a phone number from Twilio. Click on 'Get a Twilio Phone Number.'



8. Twilio will assign you a phone number. Now let's configure Twilio with Zoho Bookings.



Note - To get a premium number, navigate to Phone numbers > Manage > Buy a Number
 
Choose which country's number you wish to get, SMS (as capability), and click search. You can click on buy to obtain the number.



9. Scroll to the bottom of Twilio's main dashboard. You'll find three fields here, Auth Token, Account SID, and your Phone number. We'll paste all this data to integrate Zoho Bookings and Twilio.'



10. Now log in to your Zoho Bookings Dashboard. Navigate to Integrations > Others > Twilio. Hover over Twilio and click on Configure.



11. Copy and paste the details from Twilio to the corresponding fields in Zoho Bookings. Once you have pasted the details, click 'Configure.'
 

Note: While pasting the phone number, remove the country calling code. In this case, my phone number was +13203628918. '+1' is the country calling code. Remove it and paste the rest (i.e., 3203628918 without any spaces/symbols in between)



12. Hover over the created Twilio connection and click enable. Reload the page if the connection is still not active. You've successfully integrated Twilio with Zoho Bookings.


Editing Your Twilio Connection

To edit your Twilio connection, hover over the Twilio integration and click on edit. Once you've made the changes, click Configure.



If you wish to remove your Twilio connection, hover over the Twilio integration and click remove.



A pop-up appears asking you to confirm. Click 'Proceed' to delete your Twilio connection.



Note - While Editing or Removing your Twilio connections, if the changes don't reflect immediately, reload the page for the changes to reflect.

Configuring SMS Notifications

To configure SMS notifications for one on one bookings, navigate to services > service notification.



To configure SMS notifications for group/ resource bookings, navigate to settings > workspaces > notifications.


You'll see two tabs here. 'For Staff' and 'For Customers.' Zoho Bookings allows you to send eight different types of SMS under each tab.



You can configure Zoho Bookings to send SMS using Twilio when you change the appointment status to
  • Booked
  • Rescheduled
  • Canceled
  • Marked As Completed
  • Marked As No Show
Alternatively, you can set up to three reminders before your appointment time.



Illustration: Let's send SMS notifications to a customer when an appointment(one-on-one) is booked.

  1. Make sure that the checkbox is enabled corresponding to the booked notification in the customer tab. It ensures that the customer receives an SMS notification when an appointment is booked.


 2. To customize the messages that will be sent, click on customize. You can change the message and insert dynamic variables like meeting info, customer name, meeting date, and more into your outgoing messages. Click 'Save' once you are done with the changes.



The customer receives the following message when an appointment is made.


Note that the message is from the number '59039000' and not my original phone number. This is because the message is sent from a US number to an Indian Number. So the original long code is replaced with this number to ensure seamless deliverability.
 
If the sender and recipient belong to the same country, then the SenderID (i.e., your phone number) doesn't change.
 
There are cases where you might want to block incoming messages. For example, customers might reply to your SMS notifications requesting a reschedule or cancellation. This breaks the flow of Zoho Bookings and introduces unnecessary manual work. If that's the case, check out this document to block all incoming messaging.

SMS Customization Recommendations

  • Since each message can accommodate only 160 characters, we recommend keeping your message crisp. Include vital info like appointment date, time, and business name.
  • Avoid using emojis in your sms. As a single emoji consumes a lot of characters.
  • We recommend you have your entire message length from 160 to 320 characters (i.e., 1 to 2 messages per message) to avoid consuming too many message credits for a single SMS.

Zoho Bookings Plans supporting this feature

Applicable in
Premium

If you want to start a trial of the Zoho Bookings Premium plan, please send an email to support@zohobookings.com including the word 'Twilio' in the subject line.


    Access your files securely from anywhere

        All-in-one knowledge management and training platform for your employees and customers.






                              Zoho Developer Community




                                                    • Desk Community Learning Series


                                                    • Digest


                                                    • Functions


                                                    • Meetups


                                                    • Kbase


                                                    • Resources


                                                    • Glossary


                                                    • Desk Marketplace


                                                    • MVP Corner


                                                    • Word of the Day


                                                    • Ask the Experts





                                                              Manage your brands on social media



                                                                    Zoho TeamInbox Resources



                                                                        Zoho CRM Plus Resources

                                                                          Zoho Books Resources


                                                                            Zoho Subscriptions Resources

                                                                              Zoho Projects Resources


                                                                                Zoho Sprints Resources


                                                                                  Qntrl Resources


                                                                                    Zoho Creator Resources



                                                                                        Zoho CRM Resources

                                                                                        • CRM Community Learning Series

                                                                                          CRM Community Learning Series


                                                                                        • Kaizen

                                                                                          Kaizen

                                                                                        • Functions

                                                                                          Functions

                                                                                        • Meetups

                                                                                          Meetups

                                                                                        • Kbase

                                                                                          Kbase

                                                                                        • Resources

                                                                                          Resources

                                                                                        • Digest

                                                                                          Digest

                                                                                        • CRM Marketplace

                                                                                          CRM Marketplace

                                                                                        • MVP Corner

                                                                                          MVP Corner







                                                                                            Design. Discuss. Deliver.

                                                                                            Create visually engaging stories with Zoho Show.

                                                                                            Get Started Now


                                                                                              Zoho Show Resources

                                                                                                Zoho Writer

                                                                                                Get Started. Write Away!

                                                                                                Writer is a powerful online word processor, designed for collaborative work.

                                                                                                  Zoho CRM コンテンツ




                                                                                                    Nederlandse Hulpbronnen


                                                                                                        ご検討中の方




                                                                                                                • Recent Topics

                                                                                                                • kanban view for client portal

                                                                                                                  Are kanban views an option for client portals? Access to Kanban views in the client portals would solve some mobile-compliant issues I have with the UI. Kanban functions very nicely on mobile and would be a super asset for my clients and vendors as they
                                                                                                                • Credit Card Pre-Authorization with later Capture/Settlement

                                                                                                                  We really enjoy the convenience of being able to pay off a customer's invoice using our Auth.Net integration with Zoho Books. Unfortunately, we can only take advantage of this feature with a small percentage of our customers as it leaves a gaping hole
                                                                                                                • Zoho Cliq not working on airplanes

                                                                                                                  Hi, My team and I have been having this constant issue of cliq not working when connected to an airplane's wifi. Is there a reason for this? We have tried on different Airlines and it doesn't work on any of them. We need assistance here since we are constantly
                                                                                                                • Zoho Sign 2025–2026: What's new and what's next

                                                                                                                  Hello! Every year at Zoho Sign, we work hard to make document signing and agreement execution easy for all users. This year we sat down with our head of product, Mr. Subramanian Thayumanasamy, to discuss what we delivered in 2025 and our goals for 2026.
                                                                                                                • Work Orders / Bundle Requests

                                                                                                                  Zoho Inventory needs a work order / bundle request system. This record would be analogous to a purchase order in the purchasing workflow or a sales order in the sales cycle. It would be non-journaling, but it would reserve the appropriate inventory of
                                                                                                                • Izettle or Sumup Integration for Zoho Books.

                                                                                                                  The Stripe & Square clearing works great in Zoho Books. Any further integrations planned in the future for Izettle or Sumup? These card processors are very common for taking payments with a card reader.
                                                                                                                • Train Zoho Answer Bot Based on Customer

                                                                                                                  Hi all, Is it currently possible to mark Help Centre articles to a specific customer, and restrict the answer bot to only use relevant information if it is either marked as "General", or tagged for the specific customer in question? We currently have
                                                                                                                • Detailed list of scoring rules in Zoho CRM

                                                                                                                  Good morning Zoho community, warm greetings The reason for my message today is that I have a problem with my CRM, which I will explain below: Our organization has scoring rules designed to rate our potential customers or leads in the application based
                                                                                                                • Trying to access records in a custom module in Zoho Desk and not having luck

                                                                                                                  I've built a custom module in Zoho Desk and am using a custom function to query the records in the module and I'm not having any luck. The only way I have found to retreive a record is by getting it by its recordID (the long zoho assigned one). The function
                                                                                                                • Composite items inside of composite items; bill of materials needed

                                                                                                                  Hi Zoho and Everyone, I am evaluating whether Zoho Inventory will work for my small business. I grow and harvest herbs and spices but also get from wholesalers. I use all these items to make herbal teas, but also sell them as individual items on my Shopify store and Etsy. I discovered the composite item bundling and am wondering if I could get some assistance since there is no bill of materials: Our herbal company's best selling tea is a sleepytime tea. Sleepytime Tea can be purchased in three weights
                                                                                                                • ZOHO Books Smart Accounting Software for Travel Agency

                                                                                                                  Dear Travel partner, Contact for Travel Agency Accounting Setup & Training Vansh Travel (ZOHO Books Authorised partner) Email: info@vanshtravel.com Mo: +91 98984 95155 Please find PDF   
                                                                                                                • 452 Mailbox delivery restricted by policy error

                                                                                                                  We have been testing Zoho desk for about a week now and have been forwarding emails in via an Exchange Online Mail flow rule without issue until yesterday. Suddenly yesterday morning we started getting the vast majority of the emails stuck in Pending
                                                                                                                • Send Email reply on behalf of Agent

                                                                                                                  Hi, When using the send email reply via the API I can set the reply on behalf of the customer by using impersonatedUserId in the header of the API call. Is there a way to do this for Agents too? I need to be able to send an email reply on behalf of an
                                                                                                                • Sharing Tickets to a team within a department

                                                                                                                  Hi there, We have a need for one department to be able to share tickets to a specific team within a department, I'm wondering if this is possible? All the shared tickets are going into the 'Shared Tickets' view for the whole department but is there a
                                                                                                                • Removing To or CC Addresses from Desk Ticket

                                                                                                                  I was hoping i could find a way to remove unnecessary email addresses from tickets submitted via email. For example, a customer may email the support address AND others who are in the helpdesk notification group, in either the TO or CC address. This results
                                                                                                                • Do not use isnull()

                                                                                                                  Does not always return booleans. Can also return null. Never use this function. Just use var==null instead.
                                                                                                                • Organization wide Account and Contacts Visibility/Sharing Capabilities?

                                                                                                                  Has anyone figured out a way to make visibility or sharing of Accounts and Contacts to be available across the entire organization without having to have every individual user edit their Sharing permissions? For our sales folks they need to be able to
                                                                                                                • Is there a way to configure dark mode for Campaigns emails that go out to customers?

                                                                                                                  I've found a lot of information on how to configure dark mode for my (The user) personal Zoho workspace and email, but is there any way to edit dark mode settings on emails that we send out to customers via campaigns?  We sent out a test email the other
                                                                                                                • When Does WorkDrive integrate with Books?

                                                                                                                  When Does WorkDrive integrate with Books?
                                                                                                                • How do I import Connected Records for a Deal?

                                                                                                                  Can you point me to an example of the CSV file that would add related records to an existing CRM Deal? I imported a Deal, then tried importing a connected record using a unique ID that references the Deal ID, but it doesn't attach it to the Deal rec
                                                                                                                • FSM integration with Books

                                                                                                                  Hi, I have spent a few months working with FSM and have come across a critical gap in the functionality, which I find almost shocking....either that, or I am an idiot. The lack of bi-directional sync between Books and FSM on Sales Orders/ Work Orders
                                                                                                                • How to close an estimate ?

                                                                                                                  Hello, I have created estimates, and converted them to invoices to get 50% payment. Now I have 2 cases where the estimate stills shows status partially invoiced, however: 1. for one of them, project stopped half way, so the remaining part will never be
                                                                                                                • Power up your Kiosk Studio with Real-Time Data Capture, Client Scripts & More!

                                                                                                                  Hello Everyone, We’re thrilled to announce a powerful set of enhancements to Kiosk Studio in Zoho CRM. These new updates give you more flexibility, faster record handling, and real-time data capture, making your Kiosk flows smarter and more efficient
                                                                                                                • How do you print out the invoices comments

                                                                                                                  I have some invoices where i need to print out the comments that show when reminders and etc were sent how do we print those out in Zoho Books.
                                                                                                                • Unable to load a specific image

                                                                                                                  Hi I am trying to upload an svg file, which reports that there is "a problem with the file", but does not say what sort of problem. I can't find anything which says which files are supported, so it may be it does not support svg. (which would be a real shame) The file itself will open in either Firefox or Chrome without problem. For the moment I am using a png file, which does not zoom well of course. David
                                                                                                                • Why does the Address field show the wrong map location even with a correct Pincode?

                                                                                                                  I am noticing an issue with the Address field map in Zoho Creator. When I enter a city name that exists in multiple locations within the same state, the map sometimes points to the wrong area even if I have entered the correct Pincode. Currently, it seems
                                                                                                                • Uploaded files are not included when using "Include user submitted data" in Email Notification

                                                                                                                  In Send Email notification workflow in Zoho Creator, there is an option called "Include user submitted data" which allows the email to contain all the form submission details. However, when this option is enabled, files or images uploaded through File
                                                                                                                • Books <-> CRM synchronisation with custom Fields

                                                                                                                  Hello, We are synchronising Books Customers with CRM Accounts. In CRM Accounts I set up last year a "segments" multiselect field shown below In Books, I set up a custom multi-select field with the same value as in the CRM And set up the synchronisation inside Books. Want to synchronise the Books Segments with the CRM Segments, but the later doesn't exist, and another non-existing is there ?! First, I don't understand where the field Segmentation is coming from. Second, I set CRM Segmentation to sync
                                                                                                                • CRM x WorkDrive: We're rolling out the WorkDrive-powered file storage experience for existing users

                                                                                                                  Release plan: Gradual rollout to customers without file storage add-ons, in this order: 1. Standalone CRM 2. CRM Plus and Zoho One DCs: All | Editions: All Available now for: - Standalone CRM accounts in Free and Standard editions without file storage
                                                                                                                • Archive Option in Conversation View

                                                                                                                  Hello, I have a suggestion\request to add an "Archive Thread" button in conversation view of Zoho Mail. The best suggestion I have is to put an "Archive Thread" button next to the "Label Entire Thread" button in conversation view. Most users don't just
                                                                                                                • Outlook/Hotmail Blocking Zoho SMTP IPs (S3150)

                                                                                                                  We are currently facing a serious deliverability issue with Zoho SMTP while sending transactional OTP emails for our production application. Emails sent to Outlook / Hotmail addresses are being rejected with the following error: 550 - 5.7.1 Unfortunately,
                                                                                                                • Outlook is blocking incoming mail

                                                                                                                  Outlook is blocking all emails sent from the Zoho server. ERROR CODE :550 - 5.7.1 Unfortunately, messages from [136.143.169.51] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). It looks
                                                                                                                • Track Marketing Automation Campaigns in Zoho CRM

                                                                                                                  Hello, I've been searching but haven't found the exact answer to this question. I am looking to track Marketing Automation email campaigns and activities inside of Zoho CRM. Use Case: Action: Prospect Submits A Lead Form Outcomes: Prospect created in
                                                                                                                • Zoho Social API for generating draft posts from a third-party app ?

                                                                                                                  Hello everyone, I hope you are all well. I have a question regarding Zoho Social. I am developing an application that generates social media posts, and I would like to be able to incorporate a feature that allows saving these posts as drafts in Zoho Social.
                                                                                                                • Temporarily rate limited due to IP reputation.

                                                                                                                  We have suddenly started receiving the following Mail Delivery Status Notification: Diagnostic-Code: 4.7.650 The mail server [136.143.184.12] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://aka.ms/postmaster
                                                                                                                • Incorrect Functioning of Time Logs API (Version 3)

                                                                                                                  We need to fetch the list of time logs for each task for our company internal usage. We are trying to achieve it by using the next endpoint: https://projects.zoho.com/api-docs#bulk-time-logs#get-all-project-time-logs Firstly, in the documentation the
                                                                                                                • IMPORTANT: It doesn´t search for letters with portuguese characters.

                                                                                                                  Some of my articles have for example the word "vídeo". But if I search for "vídeo" it doesn´t find them. If I search for "video" it does find them. Idealy, it should find the articles either way. But if I have to choose, it would be better to find the
                                                                                                                • IMPORTANT: It doens´t show full article name on search - Should add line break

                                                                                                                  When we search for articles, it doesn´t show the full name. There should be a line break so the user can see the full article name, otherwise the user can´t know if that´s the article he/she is looking for. This is very important, otherwise the user has
                                                                                                                • Zoho Books - Payment Gateway - Revolut

                                                                                                                  Hi Books Team, My feature request if to include the popular platform Revolut as a payment collection option on invoices in Zoho Books. Please upvote if you are also looking for this option.
                                                                                                                • Zoho Books | Product updates | January 2026

                                                                                                                  Hello users, We’ve rolled out new features and enhancements in Zoho Books. From e-filing Form 1099 directly with the IRS to corporation tax support, explore the updates designed to enhance your bookkeeping experience. E-File Form 1099 Directly With the
                                                                                                                • Next Page