To add another card on the same subscription ID, you will just have to replace one request parameter in the Payment Key Request explained in Payment API Flow.

You will follow the normal API Flow i.e. :

1. Authentication Request:

The Authentication request is an elementary step you should do before dealing with any of Accept's APIs.
It is a post request with a JSON object that contains your api_key found in your dashboard - Profile tab.

URL: https://accept.paymob.com/api/auth/tokens

Method: POST

Source: Merchant's server

Recipient: Accept's server

Content-Type: JSON

Example request data:

{
    "api_key": "ZXlKaGJHY2lPaUpJVXpVe..."
}
ParameterRequiredDescription
api_keyYesIt is a unique identifier for the merchant which used to authenticate your requests calling any of Accept's API.

Example response:

{
    "token": "ZXlKaGJHY2lPaUpJVXpVeE1pSXNJ..."
}
ParameterRequired for the next requestDescription
tokenYesAuthentication token, which is valid for one hour from the creation time.

2. Order Registration API

At this step, you will register an order to Accept's database, so that you can pay for it later using a transaction.
Order ID will be the identifier that you will use to link the transaction(s) performed to your system, as one order can have more than one transaction.

URL: https://accept.paymob.com/api/ecommerce/orders

Method: POST

Source: Merchant's server

Recipient: Accept's server

Content-Type: JSON

Example request data:

{
  "auth_token":  "ZXlKaGlPaUpJVXpVeE1pSX1Y0NJmV5Sn...",
  "delivery_needed": "false",
  "amount_cents": "100",
  "currency": "EGP",
  "merchant_order_id": 5,
  "items": [
    {
        "name": "ASC1515",
        "amount_cents": "500000",
        "description": "Smart Watch",
        "quantity": "1"
    },
    { 
        "name": "ERT6565",
        "amount_cents": "200000",
        "description": "Power Bank",
        "quantity": "1"
    }
    ],
  "shipping_data": {
    "apartment": "803", 
    "email": "[email protected]", 
    "floor": "42", 
    "first_name": "Clifford", 
    "street": "Ethan Land", 
    "building": "8028", 
    "phone_number": "+86(8)9135210487", 
    "postal_code": "01898", 
     "extra_description": "8 Ram , 128 Giga",
    "city": "Jaskolskiburgh", 
    "country": "CR", 
    "last_name": "Nicolas", 
    "state": "Utah"
  },
    "shipping_details": {
        "notes" : " test",
        "number_of_packages": 1,
        "weight" : 1,
        "weight_unit" : "Kilogram",
        "length" : 1,
        "width" :1,
        "height" :1,
        "contents" : "product of some sorts"
    }
}
ParameterRequiredDescription
auth_tokenYesThe authentication token obtained from Step 1
delivery_neededYesSet it to be true if your order needs to be delivered by Accept's product delivery services.
amount_centsYesThe price of the order is in cents.
merchant_order_idNoA unique alpha-numeric value, for example: "E6RR3".
Discard it from the request if you don't need it.
itemsYeslist of objects contains the contents of the order if it exists, send it as an empty array if it is not available. However, Mandatory for Souhoula and GET_GO payment methods.
shipping_dataNoMandatory if your order needs to be delivered, otherwise you can delete the whole object.
shipping_detailsNoMandatory if your order needs to be delivered, otherwise you can delete the whole object.

Example response:

{
  "id": 103,
  "created_at": "2017-01-10T05:41:15.700814Z",
  "delivery_needed": "false",
  "merchant": {
      "id": 28,
      "created_at": "2016-11-17T15:02:53.646620Z",
      "phones": [
          "011111111111",
          "012324151432"
      ],
      "company_emails": [
          "[email protected]",
          "[email protected]"
      ],
      "company_name": "Wuckert, Zieme and Dach",
      "state": "Oklahoma",
      "country": "Oman",
      "city": "Port Arvillachester",
      "postal_code": "83372",
      "street": "Walker Ramp"
  },
  "collector": "null",
  "amount_cents": 100,
  "shipping_data": {
      "id": 80,
      "first_name": "test",
      "last_name": "account",
      "street": "example",
      "building": "6",
      "floor": "4",
      "apartment": "404",
      "city": "cairo",
      "state": "egypt",
      "country": "egypt",
      "email": "[email protected]",
      "phone_number": "00201000212058",
      "postal_code": "123456",
      "extra_description": "test asdf",
      "shipping_method": "EM",
      "order_id": 103,
      "order": 103
  },
  "currency": "EGP",
  "is_payment_locked": "false",
  "merchant_order_id": "null",
  "wallet_notification": "null",
  "paid_amount_cents": 0,
  "items": []
}
ParameterRequired for the next requestDescription
idYesThis is the ID of your order in Accept's database, so you can use this reference to perform any action to this Order.

3. Payment Key Request

At this step, you have to pass "subscriptionv2_id" with your integration ID so that this transaction would be considered the first transaction/Initial transaction as well as, this card will also be added as a secondary card with the previously added card

you will obtain a payment_key token in response to this API. This key will be used to authenticate your payment request. It will be also used for verifying your transaction request metadata.

URL: https://accept.paymob.com/api/acceptance/payment_keys

Method: POST

Source: Merchant's server

Recipient: Accept's server

Content-Type: JSON

Example request data:

{
  "auth_token": "ZXlKaGlPaUpJVXpVeE1pSX1Y0NJmV5Sn...",
  "amount_cents": "100", 
  "expiration": 3600, 
  "order_id": "103",
  "billing_data": {
    "apartment": "803", 
    "email": "[email protected]", 
    "floor": "42", 
    "first_name": "Clifford", 
    "street": "Ethan Land", 
    "building": "8028", 
    "phone_number": "+86(8)9135210487", 
    "shipping_method": "PKG", 
    "postal_code": "01898", 
    "city": "Jaskolskiburgh", 
    "country": "CR", 
    "last_name": "Nicolas", 
    "state": "Utah"
  }, 
  "currency": "EGP", 
  "integration_id": 1,
  "subscriptionv2_id":4,
  "lock_order_when_paid": "false"
}
ParameterDescriptionMandatory
subscriptionv2_idA subscription ID will be passed against this parameter where the additional card needs to be added.Yes