Collecting payments is all about convenience, right?
This is important because a Pay Now button inside the invoice can help you,
Even a small improvement in payment turnaround time can have a huge impact on your business cash flow. Making it easy to pay is one of the simplest ways to reduce outstanding payments.

Instant Verification through Stripe Financial Connection in the Online Payment gateway setup page.
Allow this customer to pay via bank account at the customer level.
A payment gateway that is connected but not fully configured can confuse customers and delay payments.

Things to Remember
Late payment is usually a friction problem, not a customer problem. The easier you make the payment experience, the faster invoices tend to get cleared.

Pro Tip: Use Request Payment Information (if supported in your edition) to collect your customer's card or bank information, so you can initiate charges when the client has trouble processing the payment on their end.

Watch out: Although Zoho Invoice itself does not charge any transaction fee for online payment, transaction fees are real and are processed by the gateway. Before enabling online payments, check the gateway transaction fee, currency conversion fees, etc.

Important Links:
Integrate Payment Gateway: https://www.zoho.com/invoice/help/online-payments/
Receiving Online Payment: https://www.zoho.com/invoice/help/invoice/payments-received.html#online-payments
Configuring Stripe ACH: https://www.zoho.com/invoice/help/online-payments/stripe-ach.html
Working with Zoho's very own gateway, Zoho Payments: https://www.zoho.com/invoice/help/online-payments/zoho-payments.html
#6 Your Invoice Is a Branding Document