Building extensions #5: Creating custom connections for extensions

Building extensions #5: Creating custom connections for extensions

In our previous post, we discussed the significance of connections, identified their types, developed a predefined connection, and demonstrated how it can be integrated with Zoho Books using an example. In this post, we'll walk through the process of creating a custom connection using an example.

Custom connections facilitate the integration of applications with Zoho Books by aiding in configuring the required application's connection manually by providing application-specific details. Let's go over the steps involved in configuring custom connections in detail using a use case scenario.

Use case

Let's say an organization uses Zoho Books to manage its financial operations. To improve sales for the organization, one must contact and communicate with multiple clients, as well as check in with vendors on a regular basis to remain up to date on new products on the market, take demos, and assess whether the products need to be brought into the organization.

In these cases, it is best to schedule appointments with clients and vendors in order to conduct business in an organized manner. This can be easily performed by integrating an appointment scheduling software so appointments can be scheduled with a click.

For our demo purpose, let's consider Zoho Bookings as the appointment scheduling software. Since it is not available under the default list of services in predefined connections, let's create a custom connection to achieve this.

Steps to create a custom connection
  • Go to Sigma and access your workspace.
  • Enter the developer portal of the Zoho Books extension you're creating a connection for.
  • Navigate to the Build section and click Connections.
   
  • Click New Connection to create a new connection.
NotesNote: Alternatively, you can use the View All option under a connection type to see all the services under that particular connection type and begin creating connections.
     
  • Choose Custom Services and click Create Service.
   
  • Provide the details of the service.
➤ Enter a name for the service, and the service link name will be immediately filled in.
➤ Choose the authentication type that corresponds to the authentication mechanism supported by the service for which you are building the connection. These details will be available as part of the service's API documentation. For our example, we'll use OAuth2, because Zoho Bookings supports it as an authentication mechanism.         
  
➤ The remaining fields to be configured for the service differ based on the authentication type used. In our case, the parameter type is Header, and the grant type is Authorization Code.
   
➤ Please refer to the table below for the values that need to be configured in the remaining fields.
Note: Register the service in the Zoho Developer API console to get the client credentials.
  • Finally, click the Create Service button.
  
  • The service is created successfully. Click Create Connection to create a connection for this service.
  • Provide the connection details, select the scope, and click Create and Connect.
 
  • Proceed with the flow to accept the scopes and authorize the connection.
 

The connection is now authorized, and you'll be directed to the connection details page. This page will also contain sample code in both Deluge and JSON formats that can be used to utilize this connection as part of your extension components. Depending on which component you want to invoke the connection in, you can use the appropriate sample code format.

Additionally, a predefined connection for Zoho Books is created to perform operations on Zoho Books data to implement our use case. Get more information on predefined connections in our previous post.

Now, in accordance with our use case, let's create a custom button that includes this connection to schedule appointments (in Zoho Bookings) with clients and vendors using Zoho Bookings with a single click (from Zoho Books).
We require two custom fields for our logic, one for setting the meeting start time with the client or vendor, and the other to display the Bookings appointment calendar link once the meeting is scheduled.
  • Create custom fields for the Customers and Vendors module by selecting Preferences > Customers and Vendors > Field Customization > New Custom Field.
 
  • Next, create a custom button and include the logic to schedule an appointment.
  • Create a custom button for the Customers and Vendors module by selecting Preferences > Customers and Vendors > Custom Buttons > New.
InfoBook meeting custom button function Deluge code - Please find code snippet as an attachment in the post
  • In the above code, the Get Contacts API of Zoho Books is invoked through the InvokeURL method using the predefined connection to get the contact/customer details for whom the appointment has to be scheduled in Zoho Bookings. Refer to this post to get complete details on the parameters required to call the InvokeURL method.
  • From the API response, the required details are fetched from which the start time (custom field data) is formatted to the way required by the Zoho Bookings API.
  • Next, the Zoho Bookings API to get the service ID and staff ID are invoked consecutively through the InvokeURL method using the custom connection created.
  • The Book appointment API is used to schedule the appointment using the service ID, the staff ID obtained from the Zoho Bookings API, and customer details obtained previously via the Zoho Books API.
  • Finally, using the update contact Zoho Books API, the Zoho Bookings calendar URL is updated in the custom field created to display the calendar booking URL.
We've now completed the extension setup for our use case.

After testing and publishing the extension, as per our use case, you can book a meeting for a Zoho Books customer through Zoho Bookings and have your Zoho Bookings calendar reflected inside Zoho Books as well.

z
This is an example demonstration of the benefits of using a custom connection in a Zoho Books extension. This is a versatile use case that may even be used to schedule an internal meeting with your Zoho Books teammates who are working on a project. Similarly, this use case can be enhanced and implemented based on your needs.

We hope you found this information useful. Keep following us for more tips.

SEE ALSO


      Zoho Campaigns Resources


        • Desk Community Learning Series


        • Digest


        • Functions


        • Meetups


        • Kbase


        • Resources


        • Glossary


        • Desk Marketplace


        • MVP Corner


        • Word of the Day


        • Ask the Experts


          Zoho CRM Plus Resources

            Zoho Books Resources


              Zoho Subscriptions Resources

                Zoho Projects Resources


                  Zoho Sprints Resources


                    Zoho Orchestly Resources


                      Zoho Creator Resources


                        Zoho WorkDrive Resources



                          Zoho CRM Resources

                          • CRM Community Learning Series

                            CRM Community Learning Series


                          • Tips

                            Tips

                          • Functions

                            Functions

                          • Meetups

                            Meetups

                          • Kbase

                            Kbase

                          • Resources

                            Resources

                          • Digest

                            Digest

                          • CRM Marketplace

                            CRM Marketplace

                          • MVP Corner

                            MVP Corner




                            Zoho Writer Writer

                            Get Started. Write Away!

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

                              Zoho CRM コンテンツ






                                ご検討中の方

                                  • Recent Topics

                                  • Vertical images displayed as horizontal

                                    Some pictures that originally are in vertical position are displayed in horizontal after the upload. It seems that system rotates them by 90 degrees. How can I fix this issue?
                                  • Zoho Desk iOS app update: Saved filters and sort options

                                    Hello everyone! Saved filters created on the web(desk.zoho.com) for tickets are now accessible on the Zoho Desk iOS app. You can easily rename, delete, or clear filters on the go. We have also introduced Sort options on the ticket listing screen, allowing
                                  • Introducing VeriFactu Support in Zoho Books

                                    Hello users, Spain has introduced the VeriFactu system under Real Decreto 1007/2023 to ensure integrity, traceability, and anti-fraud compliance in e-invoicing. Starting January 1, 2026, all B2B invoices must be reported to Agencia Estatal de Administración
                                  • Big Things Just Dropped in the SalesIQ Universe: Top Upgrades You’ll Love in Nova’25

                                    Nova'25 has landed, and it’s packed with meaningful upgrades to help you engage smarter, work faster, and scale with ease. Whether you're into proactive messaging, smarter automation, or better admin control, there's something here for everyone. Here's
                                  • Time Entries in Analytics

                                    I am trying to import a zoho sheet into zoho analytics. In my sheets one of the columns has "time Entries" in this "format HH:MM am/pm" example 11:00 PM. After import, i noticed that analytics converted the time to "00 Jan 1900 23:00:00".. how do i maintain
                                  • Amazon invoice in Zoho Books

                                    I have just made my first few sales on Amazon India. Amazon Seller account generates invoices for the sales made on Amazon. These invoices are sent to customers also. Now when I was only making offline sales, I used to create Invoices in Zoho Book. Now
                                  • Zoho Creator Upcoming Updates - November 2025

                                    Hello everyone, Welcome to your monthly roundup of new features and enhancements! We hope you've already taken a look at Release Projection 2—it details the features coming your way for the rest of the year. And this month, we're excited to start rolling
                                  • Table dimensions

                                    I try changing the dimensions of the table on my computer but it doesn't change. Do I have to be a premium member or does it only work on the app?
                                  • Zoho Webinar + HubSpot : Simplifiez la gestion de vos données de webinaires

                                    Les webinaires sont aujourd’hui essentiels pour interagir avec vos prospects et vos clients. Cependant, la gestion des données entre plusieurs plateformes peut vite devenir complexe. Grâce à la nouvelle intégration entre Zoho Webinar et HubSpot, vos outils
                                  • I am trying to give access to one of our educators access to 3 forms in Zoho and she is not able to view the data - Access issue

                                    Hi Team, When I try to provide read access to one of our educators on Zoho for Pre-training , post training and Impact survey forms submit form access which also allows them to read , it does not show them data
                                  • How to book GST paid in zoho books

                                    hi, i am a new user to Zoho books and not able to book GST paid in books, kindly suggest how i can book it in books. thanks, siddharth
                                  • PUNJAB NATIONAL BANK (CORPORATE) INDIA - NOT AVAILABLE IN BANKING

                                    Dear sir, Kindly fix it. PUNJAB NATIONAL BANK (INDIA) is available but PUNJAB NATIONAL BANK (CORPORATE) is not available. Kindly enable this banking since we need to categorize the entries. Regards, Sanjay Jena email id/ user id : travewithmerchant@
                                  • Employment Contract / HRMS Documents - Zoho People

                                    How do I create customized HR documents for disbursal from Zoho People ? Example, say offer letters ? appointment letters ? Memos ? We want to be able to preset these in one or ther other form and issue them to employees who are in Zoho People.
                                  • Is it possible to create a word cloud chart in ZoHo Analystics?

                                    Hi there, I have a volume of transaction text that I would like to analyse using word cloud (or other approcah to detect and present word frequency in a dataset). For example, I have 50,000 records describing menu items in restaurants. I want to be able
                                  • Playback and Management Enhancements for Zoho Quartz Recordings

                                    Hello Zoho Team, We hope you're all doing well. We would like to submit a feature request related to Zoho Quartz, the tool used to record and share browser sessions with Zoho Support. 🎯 Current Functionality As of now, Zoho Quartz allows users to record
                                  • Kaizen #216 - Actions APIs : Email Notifications

                                    Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are
                                  • Facturation électronique 2026 - obligation dès le 1er septembre 2026

                                    Bonjour, Je me permets de réagir à divers posts publiés ici et là concernant le projet de E-Invoicing, dans le cadre de la facturation électronique prévue très prochainement. Dans le cadre du passage à la facturation électronique pour les entreprises,
                                  • Error AS101 when adding new email alias

                                    Hi, I am trying to add apple@(mydomain).com The error AS101 is shown while I try to add the alias.
                                  • Your bot just got smarter: AI-Powered routing that reads between the lines

                                    What if your bot could tell the difference? Between a visitor who just needs a quick answer, someone actively comparing options, and a frustrated customer one click away from leaving? Most bots can't. They deliver the same response to everyone, missing
                                  • Weekly Tips : Master Keyboard Shortcuts in Zoho Mail

                                    If you spend a lot of time managing emails, switching between your mouse and keyboard can slow you down. Whether you are replying to clients, organizing your inbox, or searching for messages, every second counts. So, how can you streamline your email
                                  • Introducing custom lookup fields in the Tickets, Contacts, and Accounts modules

                                    Hello all, We are excited to announce a new enhancement that will empower you to further customize the Tickets, Contacts, and Accounts modules. Now, you will be able to create custom lookup fields in your Tickets, Contacts, and Accounts layouts for more
                                  • DKIM cannot be enabled for the domain as no verified default selector present

                                    Can't get the DKIM working. May you please check my account (nksy.us) to see what's wrong?
                                  • Contacts per department

                                    Hello, Is it possible to limit Contacts to a Department? Thanks
                                  • How to restrict user/portal user change canvas view

                                    Hi , I would like to restrict user / portal user change their canvas view because I hide some sensitive field for them. I dont want my user switch the canvas view that do not belong to them But seems Zoho do not provide this setting?
                                  • Collections Management: #3 Tackling Payment Failures

                                    Sam refreshed the dashboard. "Payment failed". Same customer. Same subscription. This is happening for the third time. He sends a usual email: "Your renewal payment failed again. Could you please check and retry?" A couple of days passed, and there was
                                  • How do I increase the email attachment size in Zoho CRM ?

                                    It looks like I'm limited to 10MB when sending an attachment using the email widget on a record in Zoho CRM. Is there a way to increase the size? Or can I use some other tool? From what I'm reading online, I'm maxed out at 10MB. Any insight would be greatly
                                  • Custom Field in Zoho Projects pulling into Analytics

                                    We have a client that we have built our their new business process using Zoho Projects, and we have build a lot of custom fields with their their Projects where they are capturing specific data points that we want to be able to track and pull data, as
                                  • Bookmark Loading is Buffering

                                    Hi, i clicked on the bookmark tab, around yesterday and since then it's been constantly buffering and doesn't allow me to access the mail's i have tried login in and out but of no help also trying to share a screenshot of the issue around 232 kb size,
                                  • Request to remove domain "greentechcoatings.vn" from previous Zoho account

                                    Hello Zoho Support, I would like to register the domain "greentechcoatings.vn" in my new Zoho Mail account, but I receive the message "This domain is already associated with another account". Please remove the domain from any previous/unknown account
                                  • WhatsApp Channels in Zoho Campaigns

                                    Now that Meta has opened WhatsApp Channels globally, will you add it to Zoho Campaigns? It's another top channel for marketing communications as email and SMS. Thanks.
                                  • Zoho sign and creator error message {"code":9043,"error_param":"Checked by","message":"Extra key found","status":"failure"}

                                    Good day, I receive the error message: {"code":9043,"error_param":"Checked by","message":"Extra key found","status":"failure"} when running below code from creator to sign, void TestForSign(int ID) { //Fetch Template Details (Optional, for dynamic mapping)
                                  • Download a writer template as .docx instead of .pdf.

                                    I have been trying to implement a feature to download a writer template as a .docx and got it working partly but it isn't good. Earlier I checked our code and I saw openurl("https://crm.zoho.com/crm/org121314/specific/Template.do?action=print&step=pdfPreview&id="
                                  • Allow the usage of Multi-Select fields as the primary field on "Layout Rules"

                                    We want to force our users to enter some explanation strings when a multi-select field has been utilized. I can't understand the reason for the usage restriction of Multi-Select fields as a primary field. This is a simple "Display hidden mandatory field
                                  • Ask the Experts 25: Experience the full spectrum of Zoho Desk’s autumn and spring releases for 2025

                                    Hello Everyone, We’re on the 25th episode of our ATE series! It's a true milestone in our live community interactions! It’s been an amazing journey since we started in October 2018. Zoho Desk has come a long way, evolving with the support of a wonderful
                                  • WriterTh

                                    After every space Writer goes to capital letters mode in my Android tablet. The cap mode stays till the second letter is typed in the word then it comes to normal mode.
                                  • Extract Archived Projects using Zoho Projects API

                                    In my organization we archive the projects when they are already completed, charged, invoiced, so that only those that are still pending process remain active. I need to access all projects (active and archived) from an external system, but the API v3
                                  • Pincode based Product Restriction

                                    we have different types of products. 1) Very bulky items like plywood. 2) Too delicate items like glass These type of products we want to sell to local customers. Other products we want to supply all over India. There should be an option to restrict products
                                  • Ask the Experts: Five-hour live Q&A session with Zoho WorkDrive product experts

                                    Have questions about WorkDrive 5.0? Let’s talk! We recently launched Zoho WorkDrive 5.0, packed with powerful updates to help your team work smarter, stay secure, and get more value from your business content. From content-centric workflows and AI-powered
                                  • File upload support for subforms

                                    Dear All, Subforms help you add and track data related to your CRM records. We've always supported most of the commonly used field types in subforms, so as to cater to your business requirements. Now we're happy to extend support to file upload fields.
                                  • Circular record relationship in CRM

                                    Given there is a lookup in custom module Transactions creating a related list on the chosen Contact record. I. e. a lookup field on Transactions module points to Contacts. The related list on a Contact record can thus have have many transaction records.
                                  • Next Page