Properties common to all Payments and Payment Requests View Source model/Payment.d.ts, line 3 Members Type: number # grossAmount The gross amount to be paid. Must be positive except for refunds View Source model/Payment.d.ts, line 17 Type: string # merchantReferenceId The unique reference for the payment as defined by the Merchant View Source model/Payment.d.ts, line 13 Type: string # paymentRequestId The ID of this payment request View Source model/Payment.d.ts, line 9