The rpress_set_payment_transaction_id() function is used to set the transaction ID related to a specific purchase.
The function takes two parameters, one for the payment ID and one for the transaction ID:
rpress_set_payment_transaction_id( $payment_id, $transaction_id );
The transaction ID is passed through a filter called rpress_set_payment_transaction_id, which receives two parameters:
- $transaction_id
- $payment_id