Operation failed. Contact support for help - GoCardless integration

Problem Statement

You receive the error "Operation failed. Contact Support for help" when adding a bank payment source via API using the Create a bank account payment source API with GoCardless.

Solution

Creating a bank payment source via API for GoCardless requires:

GoCardless Pro plan: Your GoCardless account must be on a Pro plan. Contact GoCardless for details if you are not on Pro.
GoCardless advanced features in Chargebee: Chargebee must have this enabled for your GoCardless gateway account.

If you are on a GoCardless Pro plan, contact Chargebee support to enable the GoCardless advanced feature from the backend.

Why is GoCardless not appearing as a payment method on the hosted pages?

My customer status is "Active" in GoCardless but "Pending verification" with Chargebee. What's causing this?

How can I allow my customers to enter their local bank account details while making payment by Direct Debit via GoCardless within the Chargebee Checkout page?

What is the transaction limit in GoCardless? Will payments fails after that?