Based on the available documentation for the Send and Wait for Approval operation in the Gmail node, there isn’t an option to customize the redirect URL for the approval button. The node’s configuration allows you to set the approval/disapproval labels and styles, but the behavior on click—namely, the redirection—is fixed and cannot be altered to point to an external webpage.
For scenarios that require custom redirection or more complex interaction flows after approval, you might consider using alternative approaches such as:
- Incorporating a Form Trigger node in combination with a custom approval workflow.
- Using the Wait node for more complex approvals where you can control the subsequent steps.
At this time, however, the Send and Wait for Approval operation does not offer a parameter to redirect users to a different webpage than the default.