How do I stop a payment from occurring?

If the transaction is still in a "Pending" status, you can void the ACH or Credit Card through the TransactAPI Dashboard or through the API.

If the transaction is still in a "Pending" status, you can void the ACH or Credit Card through the TransactAPI Dashboard or through the API.

Through the TransactAPI Dashboard:

Dashboard > View Payments > Select "Void" option under the action column

Through the API:

requestForVoidAch

requestForVoidCCTransaction