Treat each payment as a separate record
Record the method, amount, currency, and transaction reference for each part of the order. Calculate the balance using confirmed payments and posted adjustments. Check whether the checkout can represent the combination accurately before offering it.
Test a partial success and a full reversal
- Check what happens when one part is approved and the next part is canceled or declined.
- Verify how the provider and store report which amounts were charged or reversed.
- Record how a partial or full refund is allocated across methods in the merchant and customer records.
Keep the remaining amount visible
Show staff and customers what has been paid, what remains due, and which method is available for the balance. Keep fulfillment tied to your verified payment policy. If a replacement payment request is needed, confirm the amount already collected before sending it.
Sources and further reading
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