When accessing these tags on documents and emails that have access to entries, OrderPayment can be added as a prefix to the tag or the order payments loop can be used.

{{OrderPayment.TagName}}    or    <!--{{#each OrderPayments}}-->{{TagName}}<!--{{/each}}-->

Additional Sub Object
AmountThe amount of the payment applied to the order.Decimal Value
IdThe id of the order payment.Guid
OrderThe tags relating to an order can be accessed for the order on this payment.

Order Tags
OrderIdThe id of the order.Guid
PaymentThe tags relating to a payment can be accessed for the payment this order payment is on.

Payment Tags
PaymentIdThe id of the payment.Guid