For transactions involving transfers or money orders, prepayment is mandatory. This ensures the funds are secured before the processing of the transaction, minimizing risks and delays. Clients must complete the payment in advance to initiate the order fulfillment process. Depending on the service provider, verification steps may be required to confirm the legitimacy of the payment. Always retain proof of payment for reference and ensure all necessary details, such as recipient information and transaction codes, are correctly provided to avoid processing issues.