Abstract: A method is disclosed. The method includes receiving a payment instruction file. In some cases, the payment instruction file contains a plurality of payment instructions with conditional control data to pay one or more suppliers. The conditional control data controls execution of the payment instructions. The method further includes receiving a plurality of transaction messages corresponding to the plurality of payment instructions, respectively, where each transaction message in the plurality of transaction messages is conducted using one or more payment accounts. If transaction data in a transaction message in the plurality of transaction messages does not satisfy the conditional control data, then the transaction message is declined by a server computer. If transaction data in the transaction message in the plurality of transaction messages does satisfy the conditional control data, then the transaction message is approved by the server computer.