Pay Coupon

{
  "name": "pay_coupon",
  "desc": "Pay due coupon to an account",
  "readonly": false,
  "args": [
    {
      "type": "address",
      "name": "holding_address",
      "desc": "Account Holding Address"
    },
    {
      "type": "byte[]",
      "name": "payment_info",
      "desc": "Additional payment information (Optional)"
    }
  ],
  "returns": {
    "type": "(uint64, uint64, byte[])",
    "desc": "Paid coupon amount in denomination asset, Payment timestamp, Payment context"
  },
  "errors": [
    {
      "code": "UNAUTHORIZED",
      "message": "Not authorized"
    },
    {
      "code": "DEFAULTED",
      "message": "Defaulted"
    },
    {
      "code": "SUSPENDED",
      "message": "Suspended operations"
    },
    {
      "code": "INVALID_HOLDING_ADDRESS",
      "message": "Invalid account holding address"
    },
    {
      "code": "NO_UNITS",
      "message": "No D-ASA units"
    },
    {
      "code": "NO_DUE_COUPON",
      "message": "No due coupon to pay"
    },
    {
      "code": "PENDING_COUPON_PAYMENT",
      "message": "Pending due coupon payment"
    }
  ]
}

A reference implementation SHOULD NOT require an authorized caller.

If the D-ASA has an amortizing principal payment schedule, the call MUST update the Account’s unit value.

If the call requires authorization, it MUST fail with the UNAUTHORIZED error code if not called by an authorized caller.

The call MUST fail with the DEFAULTED error code if the asset is defaulted.

The call MUST fail with the SUSPENDED error code if the asset operations are suspended.

The call MUST fail with the INVALID_HOLDING_ADDRESS error code if the Account does not exist.

The call MUST fail with the NO_UNTIS error code if the Account has no D-ASA units.

The call MUST fail with the NO_DUE_COUPON error code if there is no due coupon left to pay for the Account.

The call MUST fail with the PENDING_COUPON_PAYMENT error code if there is an old due coupon still to be paid to any account.

If the D-ASA has on-chain payment agent, the call MUST fail with the NOT_ENOUGH_FUNDS error code if funds are not enough for the payment.