This GET endpoint is used to retrieve the status of a pay-in transaction for a user with the specified token and payin token.
You can use this endpoint to check the status of a specific pay-in transaction, including whether the pay-in has been successfully processed, is still awaiting user action, or resulted in an error.
To use this endpoint, you need to provide the user_token and payin_token in the URL Path.
The response will include a JSON object containing details about the pay-in transaction, including its status, amounts, fees, any required_action, and the partner network_response.