# Process payment

A secure, signed JSON Web Token ([JWT](#jwt)) is generated when the customer selects the **Submit** button on your [payment form](/guides/javascript/add-payment-form.md).

To receive a secure and signed [JWT](#jwt) and complete the payment on your backend:

{% stepper %}
{% step %}
Call the `ClearentSDK.getPaymentToken` method.

{% code lineNumbers="true" %}

```javascript
ClearentSDK.getPaymentToken();
```

{% endcode %}
{% endstep %}

{% step %}
Add `Promises` to receive the success or error message from the `ClearentSDK.getPaymentToken()` function.

{% code lineNumbers="true" %}

```javascript
ClearentSDK.getPaymentToken().then(
    (result) => {
        // this function is called if getting a payment token was successful
        console.log("ClearentTokenSuccess");
        console.log(result);
    },
    (error) => {
        // this function is called if getting a payment token failed
        console.log("ClearentTokenError");
        console.log(error);
    }
);
```

{% endcode %}
{% endstep %}

{% step %}
Call the JWT service using the `ClearentTokenSuccess` function to receive the secure, signed, and unencrypted JSON Web Token in the [JWT](#example-decoded-unencrypted-signed-jwt) field shown below.

{% code lineNumbers="true" %}

```javascript
{
   "code":"200",
   "status":"success",
   "exchange-id":"ID-clearent-mobile-jwt-1-c32bfe39-d454-4e34-8b4f-94d850643e48",
   "payload":{
      "mobile-jwt":{
         "jwt":"eyJhbGciOi23UzIh4iJ9.eyJsYXN0LWZvdXIiOiIxMrkP8iwid
                HlwZSI6Ik1BTlVBTCIsImV4cCI6MTU0NzY0NjU2MSwidG9rZW4iOiIxMTAwMDAw
                MDAwMDEzNTkyIn0.eT8c_5yUzxCxL2MEtmbG444eTFRW7OxzRF7x4uRIo-U",
         "last-four":"1111"
      },
      "payloadType":"mobile-jwt"
   }
}
```

{% endcode %}
{% endstep %}

{% step %}
Call to the `clearent-mobile-gateway` from your backend using the `mobilejwt` field and `api-key`.

{% code lineNumbers="true" %}

```javascript
POST /rest/v2/mobile/transactions/sale
Accept:application/json
Content-Type:application/json
api-key:YOUR_API_KEY_GOES_HERE
mobilejwt:eyJhbGciOi23UzIh4iJ9.eyJsYXN0LWZvdXIiOiIxMrkP8iwid
 HlwZSI6Ik1BTlVBTCIsImV4cCI6MTU0NzY0NjU2MSwidG9rZW4iOiIxMTAw
 MDAwMDAwMDEzNTkyIn0.eT8c_5yUzxCxL2MEtmbG444eTFRW7OxzRF7x4uRIo-U
Body
{
    "type": "SALE",
    "amount": "15.55",
    "software-type": "AwesomePOSSoftware",
    "software-type-version":"1"
}
```

{% endcode %}
{% endstep %}
{% endstepper %}

You will receive the below response after successful transaction or an error response if the transaction fails.

{% code lineNumbers="true" %}

```javascript
{
    "code": "200",
    "status": "success",
    "exchange-id": "ID-clearent-mobile-gateway-1-2a6b56d3-c660-4810-95ea-9fb9a21c6634",
    "payload": {
        "transaction": {
            "amount": "15.55",
            "id": "2586119",
            "type": "SALE",
            "result": "APPROVED",
            "card": "XXXXXXXXXXXX1111",
            "csc": "999",
            "authorization-code": "TAS022",
            "batch-string-id": "938",
            "display-message": "Transaction approved",
            "result-code": "000",
            "exp-date": "1220",
            "software-type": "AwesomePOSSoftware",
            "card-type": "VISA",
            "last-four": "1111"
        },
        "payloadType": "transaction"
    }
}
```

{% endcode %}

**Example**: Decoded, unencrypted, and signed JSON Web Token (JWT)

<figure><img src="/files/HXdJYd3SXtQ1ESUWAFmT" alt=""><figcaption><p>Example: Decoded, unencrypted, signed JWT</p></figcaption></figure>


---

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```

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