Issue an Increase Check Transfer with in-house printing or third-party fulfillment and support approval, cancellation, and stop-payment workflows

Steps

1. Create a check transfer with fulfillment_method set to physical_check to have Increase print and mail the check, supplying a physical_check object with mailing details, or set it to third_party if fulfillment will be handled independently
2. If the source account requires approval for transfers, expect the transfer to enter pending_approval status and remain unsent until approved via the Approve a Check Transfer endpoint
3. Handle the cancellation field on the Check Transfer object, which is populated with cancellation details if an approval-required transfer was never approved
4. Use the Cancel a Check Transfer endpoint only while the transfer is still in pending_approval status, since later statuses such as mailed cannot be cancelled this way
5. Call the stop-payment endpoint to stop payment on a check transfer that has already progressed past cancellation, and check the stop_payment_request field on the object to confirm it was recorded
6. In sandbox, use the check-transfer mailing simulation endpoint to advance a pending_approval or pending_submission transfer to mailed status for testing, since real mailing happens periodically in production