startPinpadTransaction

The startPinpadTransaction method initiates the PinPad process on the payment terminal, instructing it to get ready to receive card information via Magnetic Stripe Read (MSR/Swipe) or Contactless (Tap). This method captures raw card data (Track 2 or EMV tags) from the physical device, preparing the system for subsequent authorization steps.

Request

📘
JSON-RPC 2.0
All methods in TweezerComm follow a JSON-RPC 2.0 structure. See Get Startedfor more details on how the requests are structured and sent.

In the request, ensure to configure the following:

The method field must be set to startPinpadTransaction.
The service must be set to engine in the params.

The request includes a list of parameters, with the first being the service name, which is currently fixed as engine, and the second being a dictionary containing all other transaction-specific details.

{
    "jsonrpc":"2.0",
    "method":"startPinpadTransaction",
    "id":"123454352",
    "params": [
        "engine",{
            "vuid": "{{$guid}}",
            "amount":100,
            "tranType":1.1
        }
    ]
}

Request Parameters

The table below describes the parameters of the request:

Name	Type	Description
`vuid`	string	Vendor (client) unique transaction identifier.
`amount`	integer	Amount of the transaction in cents.
`tranType`	float	Transaction type code. For example, `1.1` for a standard transaction.

Response

A successful request will return a response containing the captured card data, which varies depending on whether the card was read via magnetic stripe or contactless (EMV).

Magnetic Stripe Read Response

This response is returned when the card is successfully swiped via the magnetic stripe reader.

{
   "jsonrpc": "2.0",
   "id": "123454352",
   "result": {
       "statusCode": 0,
       "statusMessage": "ok",
       "pem": EMVMANAGER_MSR,
       "track2": "65458643975398"
   }
}

Response Parameters

The table below describes the response parameters for this method when a Magnetic Stripe Read occurs.

Name	Type	Description
`statusCode`	integer	The PinPad transaction status. A value of `0` indicates success.
`statusMessage`	string	The transaction message (e.g., `ok`).
`pem`	integer	POS Entry Mode, indicating the method of card entry. `EMVMANAGER_MSR` indicates a magnetic stripe read.
`track2`	string	The raw Track 2 card data captured from the magnetic stripe.

Contactless Read Response

This response is returned when the card is successfully swiped via the magnetic stripe reader.

{
   "jsonrpc": "2.0",
   "id": "123454352",
   "result": {
       "statusCode": 0,
       "statusMessage": "ok",
       "pem": EMVMANAGER_CONTACT,
       "tags": {
           "95": "tag value",
           "9F02": "tag value",
           "5A": "tag value",
           "5F34": "tag value",
           "5F2A": "tag value",
           "9F02": "tag value",
           "9F03": "tag value",
           "9A": "tag value",
           "9C": "tag value",
           "9F1A": "tag value",
           "9F21": "tag value",
           "9F37": "tag value",
           "9F36": "tag value",
           "9F26": "tag value",
           "9F27": "tag value"
       }
   }
}

Response Parameters

The table below describes the response parameters for this method when a Contactless Read occurs.

Name	Type	Description
`statusCode`	integer	The PinPad transaction status. A value of `0` indicates success.
`statusMessage`	string	The transaction message (e.g., `ok`).
`pem`	integer	POS Entry Mode, indicating the method of card entry. `EMVMANAGER_CONTACT` indicates a contactless read.
`tags`	json of strings	A dictionary containing raw EMV Tag-Value pairs captured from the contactless chip.