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Payment Requests

Payment Requests represent the intention for a merchant to receive payment for goods and services. Payment Requests define the amount to be paid and the asset types that are acceptable for payment.

A Payment Request is shared with, and paid by, a patron. The Payment Flows Guide has more details regarding negotiation of Payment Requests.

Payment Requests have the following statuses:

  • new: after being created.
  • paid: after being paid with one or more transactions.
  • cancelled: after being cancelled or voided by the merchant.
  • expired: after expiry time is reached without being paid or cancelled.

Payment requests can also be refunded for a short period of time after being paid.

Payment request state transitions can be notified to webhooks.

Centrapay Payment Requests are serviced via two sets of endpoints; the “next” version (documented on this page) and the “legacy” version (documented at Legacy Payment Requests).

Contents

Models

Payment Request

Mandatory Fields

Field Type Description
id String The payment request id.
value Monetary The canonical value of the payment request. Must be positive.
paymentOptions Array The Payment Options, indicating valid asset for payment.
merchantId String The id of the Merchant the Payment Request is on behalf of.
merchantName String The name of the Merchant the Payment Request is on behalf of.
configId String The Merchant Config id used to configure the payment options.
status String “new”, “paid”, “cancelled”, “expired”
liveness String Indicates test assets are accepted. Values are “main” or “test”.
createdAt Timestamp When the payment request was created.
updatedAt Timestamp When the payment request was updated.
expiresAt Timestamp When the payment request expires.

Optional Fields

Field Type Description
patronCodeId String The id of a Patron Code the payment request is attached to.
barcode String Scanned patron barcode used to create the payment request.
expirySeconds Number The expiry seconds used to configure the payment request expiry.
lineItems Array EXPERIMENTAL The Line Items being paid for.
purchaseOrderRef String A reference to a purchase order for this payment request.
invoiceRef String A reference to an invoice for this payment request.
redirectUrl String Experimental URL to redirect the user to after they pay or cancel the Payment Request. Must start with one of the allowedRedirectUrls for the Merchant Config.

Payment Option

Mandatory Fields

Field Type Description
assetType String An Asset Type reference.
amount BigNumber The value required to pay using the canonical units for the asset type.

Optional Fields

Field Type Description
bitcoinAddress String ★ Address to send Bitcoin, when the “assetType” is bitcoin.*
cennzAddress String ★ Address to send CPay, when the “assetType” is cennznet.*
wavesAddress String ★ Waves address to send Zap tokens, when the “assetType” is zap.*
productCodes Array Supported product codes for the payment request, when the “assetType” is epay.nzd.*

★ For payment options which specify an address, there’s a requirement to make a transaction on an external ledger. Once you have made that payment, you can use the transaction id for Paying a Payment Request.

Line Item

An order item for which payment is requested. The currency and units for a line item price will be consistent with the payment request value and the sum of line item prices should equal the payment request value.

Line items can include a discount amount. A discount that applies to multiple line items may be represented as a separate line item with a negative amount.

Mandatory Fields

Field Type Description
name String The product description.
sku String The product (stock keeping unit) code.
qty BigNumber The product quantity (eg. item count, weight, volume etc).
price BigNumber The final price in cents (eg. product price * qty - discounts + tax).

Optional Fields

Field Type Description
tax BigNumber Tax rate (percentage).
discount BigNumber Discount amount in cents (tax exclusive).
productId String Manufacturer’s product identifier (eg GTIN/EAN).
restricted Boolean Disallow payment with a “restricted” Asset Type.
classification Object Product Classification.

Product Classification

Mandatory Fields

Field Type Description
type String The classification type (see below).
code String The classification code.
name String The classification description.

Optional Fields

Field Type Description
props Map The product classification properties (see below).

Classification Types

Currently only “GS1” is supported. See GS1 Global Product Classification. When “GS1” is used as the product classification type then the product code should be the GPC product brick identifier.

Classification Properties

Classification properties allow optional additional product characterizing attrubutes to be supplied. In the case of GS1 product classifications this corresponds to the GPC brick attributes.

Operations

Create a Payment Request EXPERIMENTAL

POST /api/payment-requests

Create a Payment Request 

curl -X POST https://service.centrapay.com/api/payment-requests \
  -H "X-Api-Key: $api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "configId": "5efbe2fb96c08357bb2b9242",
    "value": {
      "amount": "8991",
      "currency": "NZD"
    }
  }'

Create a Payment Request with redirect url 

curl -X POST https://service.centrapay.com/api/payment-requests \
  -H "X-Api-Key: $api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "configId": "5efbe2fb96c08357bb2b9242",
    "value": {
      "amount": "8991",
      "currency": "NZD"
    },
    "redirectUrl": "https://example.com/store/checkout?cartId=1234"
  }'

Create a Payment Request with a Patron Code 

curl -X POST https://service.centrapay.com/api/payment-requests \
  -H "X-Api-Key: $api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "barcode": "1219210961929460",
    "configId": "5efbe2fb96c08357bb2b9242",
    "value": {
      "amount": "8991",
      "currency": "NZD"
    }
  }'

Create a Payment Request with purchase order and invoice 

curl -X POST https://service.centrapay.com/api/payment-requests \
  -H "X-Api-Key: $api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "configId": "5efbe2fb96c08357bb2b9242",
    "value": {
      "amount": "8991",
      "currency": "NZD"
    },
    "purchaseOrderRef": "oF6kj1QlH5gK0y9rjRHFh2",
    "invoiceRef": "sy8CRmo3sp3ArOpnfmb423"
  }'

Create a Payment Request with Line Items 

curl -X POST https://service.centrapay.com/api/payment-requests \
  -H "X-Api-Key: $api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "configId": "5efbe2fb96c08357bb2b9242",
    "value": {
      "amount": "6190",
      "currency": "NZD"
    },
    "lineItems": [
      {
        "name": "Coffee Grounds",
        "sku": "GH1234",
        "qty": "1",
        "price": "4195",
        "tax": "15.00"
      },
      {
        "name": "Centrapay Cafe Mug",
        "sku": "SB456",
        "qty": "25",
        "price": "1995",
        "tax": "15.00",
        "discount": "199",
        "restricted": true,
        "productId": "19412345123459",
        "classification": {
          "type": "GS1",
          "code": "10001874",
          "props": {
            "20001479": "30008960"
          }
        }
      }
    ]
  }'

Example response payload 

{
  "id": "207b5fb5-621e-4282-86c3-42ee47f87e74",
  "url": "https://app.centrapay.com/pay/207b5fb5-621e-4282-86c3-42ee47f87e74",
  "patronCodeId": "V17FByEP9gm1shSG6a1Zzx",
  "barcode": "9990001234567895",
  "merchantId": "26d3Cp3rJmbMHnuNJmks2N",
  "merchantName": "Centrapay Café",
  "configId": "5efbe2fb96c08357bb2b9242",
  "purchaseOrderRef": "oF6kj1QlH5gK0y9rjRHFh2",
  "invoiceRef": "sy8CRmo3sp3ArOpnfmb423",
  "value": { "currency": "NZD", "amount": "6190" },
  "paymentOptions": [
    {
      "amount": "6190",
      "assetType": "centrapay.nzd.test"
    },
    {
      "amount": "6190",
      "assetType": "epay.nzd.test",
      "productCodes": [ "23403" ]
    }
  ],
  "lineItems": [
      {
        "name": "Coffee Grounds",
        "sku": "GH1234",
        "qty": "1",
        "price": "4195",
        "tax": "15.00",
      },
      {
        "name": "Centrapay Cafe Mug",
        "sku": "SB456",
        "qty": "25",
        "price": "1995",
        "tax": "15.00",
        "discount": "199",
      },
  ],
  "status": "new",
  "createdAt": "2021-06-08T04:04:27.426Z",
  "updatedAt": "2021-06-08T04:04:27.426Z",
  "expiresAt": "2021-06-08T04:06:27.426Z",
  "liveness": "test",
  "expirySeconds": 120
}

Get a Payment Request by Id EXPERIMENTAL

GET /api/payment-requests/{paymentRequestId} 

curl https://service.centrapay.com/api/payment-requests/207b5fb5-621e-4282-86c3-42ee47f87e74 \
  -H "Authorization: $jwt"

Example response payload 

{
  "id": "207b5fb5-621e-4282-86c3-42ee47f87e74",
  "url": "https://app.centrapay.com/pay/207b5fb5-621e-4282-86c3-42ee47f87e74",
  "patronCodeId": "V17FByEP9gm1shSG6a1Zzx",
  "barcode": "9990001234567895",
  "merchantId": "26d3Cp3rJmbMHnuNJmks2N",
  "merchantName": "Centrapay Café",
  "configId": "5efbe2fb96c08357bb2b9242",
  "purchaseOrderRef": "oF6kj1QlH5gK0y9rjRHFh2",
  "invoiceRef": "sy8CRmo3sp3ArOpnfmb423",
  "value": { "currency": "NZD", "amount": "8991" },
  "paymentOptions": [
    {
      "amount": "8991",
      "assetType": "centrapay.nzd.test"
    }
  ],
  "lineItems": [
      {
        "name": "Coffee Grounds",
        "sku": "GH1234",
        "qty": "1",
        "price": "4195",
        "tax": "15.00",
      },
      {
        "name": "Centrapay Cafe Mug",
        "sku": "SB456",
        "qty": "25",
        "price": "1995",
        "tax": "15.00",
        "discount": "199",
      },
  ],
  "status": "new",
  "createdAt": "2021-06-08T04:04:27.426Z",
  "updatedAt": "2021-06-08T04:04:27.426Z",
  "expiresAt": "2021-06-08T04:06:27.426Z",
  "liveness": "test",
  "expirySeconds": 120
}

Get a Payment Request linked to a Patron Code EXPERIMENTAL

Returns the latest Payment Request with status “new” that has been attached to a Patron Code. The Payment Request may have been created with a reference to any Patron Code owned by the user’s account.

This endpoint should be polled just after a user’s Patron Code has been scanned. This will allow them to find the Payment Request and proceed to pay.

GET /api/me/patron-code-payment-request 

curl https://service.centrapay.com/api/me/patron-code-payment-request \
  -H "Authorization: $jwt"

Example response payload when no new Payment Request found 

{}

Example response payload with a Payment Request 

{
  "id": "207b5fb5-621e-4282-86c3-42ee47f87e74",
  "url": "https://app.centrapay.com/pay/207b5fb5-621e-4282-86c3-42ee47f87e74",
  "patronCodeId": "V17FByEP9gm1shSG6a1Zzx",
  "barcode": "9990001234567895",
  "merchantId": "26d3Cp3rJmbMHnuNJmks2N",
  "merchantName": "Centrapay Café",
  "configId": "5efbe2fb96c08357bb2b9242",
  "value": { "currency": "NZD", "amount": "100" },
  "paymentOptions": [
    {
      "amount": "100",
      "assetType": "centrapay.nzd.test"
    }
  ],
  "status": "new",
  "createdAt": "2021-06-08T04:04:27.426Z",
  "updatedAt": "2021-06-08T04:04:27.426Z",
  "expiresAt": "2021-06-08T04:06:27.426Z",
  "liveness": "test",
  "expirySeconds": 120
}