Passing custom attributes to an authorize.net checkout page - authorize.net

Question

We're going to build a portal for an authorize.net merchant. A page in this portal will have a button that will navigate to an authorize.net hosted checkout page.
Is it possible to pass custom metadata to that page which will get stored in authorize.net when the payment is complete? The goal is to allow the merchant to have a reference to the customer's identity in our system.

Answer 1

One Authorize.net Get Accept Hosted parameter designed for this purpose would be the refId (string, up to 20 characters). Which is a merchant-assigned reference ID for the request.
If included in the request, this value is included in the response.
E.g.,
{
"getHostedPaymentPageRequest": {
"merchantAuthentication": {
"name": "LOGIN",
"transactionKey": "TRANSACTION_KEY"
},
"refId": "123456",
"transactionRequest": {
"transactionType": "authCaptureTransaction",
"amount": "20.00",
"profile": {
"customerProfileId": "123456789"
},
"customer": {
"email": "ellen#example.com"
},
"billTo": {
"firstName": "Ellen",
"lastName": "Johnson",
"company": "Souveniropolis",
"address": "14 Main Street",
"city": "Pecan Springs",
"state": "TX",
"zip": "44628",
"country": "US"
}
},
"hostedPaymentSettings": {
"setting": [{
"settingName": "hostedPaymentReturnOptions",
"settingValue": "{\"showReceipt\": true, \"url\": \"https://example.com/receipt\", \"urlText\": \"Continue\", \"cancelUrl\": \"https://example.com/cancel\", \"cancelUrlText\": \"Cancel\"}"
}, {
"settingName": "hostedPaymentButtonOptions",
"settingValue": "{\"text\": \"Pay\"}"
}, {
"settingName": "hostedPaymentStyleOptions",
"settingValue": "{\"bgColor\": \"blue\"}"
}, {
"settingName": "hostedPaymentPaymentOptions",
"settingValue": "{\"cardCodeRequired\": false, \"showCreditCard\": true, \"showBankAccount\": true}"
}, {
"settingName": "hostedPaymentSecurityOptions",
"settingValue": "{\"captcha\": false}"
}, {
"settingName": "hostedPaymentShippingAddressOptions",
"settingValue": "{\"show\": false, \"required\": false}"
}, {
"settingName": "hostedPaymentBillingAddressOptions",
"settingValue": "{\"show\": true, \"required\": false}"
}, {
"settingName": "hostedPaymentCustomerOptions",
"settingValue": "{\"showEmail\": false, \"requiredEmail\": false, \"addPaymentProfile\": true}"
}, {
"settingName": "hostedPaymentOrderOptions",
"settingValue": "{\"show\": true, \"merchantName\": \"G and S Questions Inc.\"}"
}, {
"settingName": "hostedPaymentIFrameCommunicatorUrl",
"settingValue": "{\"url\": \"https://example.com/special\"}"
}]
}
}
}