Square Payment gateway integration using php

Mar 3, 2019

Square payment gateway is allows people to make money transfer through internet. And most of the eCommerce stores integrate Square payment gateway to provide online payment option. In this tutorial we will explain about the complete process of Square payment gateway integration in PHP.

Create a Square App from Square and get Application ID and Access Token.

Now download the square SDK from Square SDK

Pay with a Credit Card form with test card information:

Card Number: 4532759734545858

CVV: any three non-consecutive numbers

Expiration Date: any month and year in the future

Postal Code: 94103

Let's Start Code Integration In PHP

Here, we’ll need following files to integrate Square Payment Gateway

index.html
sqpaymentform.js
sqpaymentform-basic.css
payment-process.php

index.html


<html>
<head>
<title>Square Payment Gateway</title>
<meta charset="utf-8">
    <!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><![endif]-->
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <!-- link to the SqPaymentForm library -->
    <script type="text/javascript" src="https://js.squareup.com/v2/paymentform">
    </script>

    <!-- link to the local SqPaymentForm initialization -->
    <script type="text/javascript" src="sqpaymentform.js">
    </script>

    <!-- link to the custom styles for SqPaymentForm -->
    <link rel="stylesheet" type="text/css" href="sqpaymentform-basic.css">
	<script>
	 document.addEventListener("DOMContentLoaded", function(event) {
    if (SqPaymentForm.isSupportedBrowser()) {
      paymentForm.build();
      paymentForm.recalculateSize();
    }
  });
	</script>
</head>
<body>

<div id="form-container">
  <div id="sq-ccbox">
    <!--
      Be sure to replace the action attribute of the form with the path of
      the Transaction API charge endpoint URL you want to POST the nonce to
      (for example, "/process-card")
    -->
    <form id="nonce-form" novalidate action="payment-process.php" method="post">
      <fieldset>
        <span class="label">Card Number</span>
        <div id="sq-card-number"></div>

        <div class="third">
          <span class="label">Expiration</span>
          <div id="sq-expiration-date"></div>
        </div>

        <div class="third">
          <span class="label">CVV</span>
          <div id="sq-cvv"></div>
        </div>

        <div class="third">
          <span class="label">Postal</span>
          <div id="sq-postal-code"></div>
        </div>
      </fieldset>

      <button id="sq-creditcard" class="button-credit-card" onclick="requestCardNonce(event)">Pay $1.00</button>

      <div id="error"></div>

      <!--
        After a nonce is generated it will be assigned to this hidden input field.
      -->
	  <input type="hidden" id="amount" name="amount" value="100">
      <input type="hidden" id="card-nonce" name="nonce">
    </form>
  </div> <!-- end #sq-ccbox -->

</div> <!-- end #form-container -->
</body>
</html>

sqpaymentform.js


// Set the application ID
var applicationId = "APPLICATION-ID";

// Set the location ID
var locationId = "LOCATION-ID";


function buildForm(form) {
  if (SqPaymentForm.isSupportedBrowser()) {
    form.build();
    form.recalculateSize();
  }
}
function buildForm1() {
    if (SqPaymentForm.isSupportedBrowser()) {
      var paymentDiv = document.getElementById("form-container");
      if (paymentDiv.style.display === "none") {
          paymentDiv.style.display = "block";
      }
      paymentform.build();
      paymentform.recalculateSize();
    } else {
      // Show a "Browser is not supported" message to your buyer
    }
  }
/*
 * function: requestCardNonce
 *
 * requestCardNonce is triggered when the "Pay with credit card" button is
 * clicked
 *
 * Modifying this function is not required, but can be customized if you
 * wish to take additional action when the form button is clicked.
 */
function requestCardNonce(event) {

  // Don't submit the form until SqPaymentForm returns with a nonce
  event.preventDefault();

  // Request a nonce from the SqPaymentForm object
  paymentForm.requestCardNonce();
}

// Create and initialize a payment form object
var paymentForm = new SqPaymentForm({

  // Initialize the payment form elements
  applicationId: applicationId,
  locationId: locationId,
  inputClass: 'sq-input',
  autoBuild: false,

  // Customize the CSS for SqPaymentForm iframe elements
  inputStyles: [{
    fontSize: '16px',
    fontFamily: 'Helvetica Neue',
    padding: '16px',
    color: '#373F4A',
    backgroundColor: 'transparent',
    lineHeight: '24px',
    placeholderColor: '#CCC',
    _webkitFontSmoothing: 'antialiased',
    _mozOsxFontSmoothing: 'grayscale'
  }],

  // Initialize Apple Pay placeholder ID
  applePay: false,

  // Initialize Masterpass placeholder ID
  masterpass: false,

  // Initialize the credit card placeholders
  cardNumber: {
    elementId: 'sq-card-number',
    placeholder: 'XXXX XXXX XXXX XXXX'
  },
  cvv: {
    elementId: 'sq-cvv',
    placeholder: 'CVV'
  },
  expirationDate: {
    elementId: 'sq-expiration-date',
    placeholder: 'MM/YY'
  },
  postalCode: {
    elementId: 'sq-postal-code',
    placeholder: '12345'
  },

  // SqPaymentForm callback functions
  callbacks: {
    /*
     * callback function: createPaymentRequest
     * Triggered when: a digital wallet payment button is clicked.
     * Replace the JSON object declaration with a function that creates
     * a JSON object with Digital Wallet payment details
     */
    createPaymentRequest: function () {

      return {
        requestShippingAddress: false,
        requestBillingInfo: true,
        currencyCode: "USD",
        countryCode: "US",
        total: {
          label: "MERCHANT NAME",
          amount: "100",
          pending: false
        },
        lineItems: [
          {
            label: "Subtotal",
            amount: "100",
            pending: false
          }
        ]
      }
    },

    /*
     * callback function: cardNonceResponseReceived
     * Triggered when: SqPaymentForm completes a card nonce request
     */
    cardNonceResponseReceived: function (errors, nonce, cardData) {
      if (errors) {
        // Log errors from nonce generation to the Javascript console
        console.log("Encountered errors:");
        errors.forEach(function (error) {
          console.log(' er= ' + error.message);
          alert(error.message);
        });

        return;
      }
      // Assign the nonce value to the hidden form field
      document.getElementById('card-nonce').value = nonce;

      // POST the nonce form to the payment processing page
      document.getElementById('nonce-form').submit();

    },

    /*
     * callback function: unsupportedBrowserDetected
     * Triggered when: the page loads and an unsupported browser is detected
     */
    unsupportedBrowserDetected: function () {
      /* PROVIDE FEEDBACK TO SITE VISITORS */
    },

    /*
     * callback function: inputEventReceived
     * Triggered when: visitors interact with SqPaymentForm iframe elements.
     */
    inputEventReceived: function (inputEvent) {
      switch (inputEvent.eventType) {
        case 'focusClassAdded':
          /* HANDLE AS DESIRED */
          break;
        case 'focusClassRemoved':
          /* HANDLE AS DESIRED */
          break;
        case 'errorClassAdded':
          document.getElementById("error").innerHTML = "Please fix card information errors before continuing.";
          break;
        case 'errorClassRemoved':
          /* HANDLE AS DESIRED */
          document.getElementById("error").style.display = "none";
          break;
        case 'cardBrandChanged':
          /* HANDLE AS DESIRED */
          break;
        case 'postalCodeChanged':
          /* HANDLE AS DESIRED */
          break;
      }
    },

    /*
     * callback function: paymentFormLoaded
     * Triggered when: SqPaymentForm is fully loaded
     */
    paymentFormLoaded: function () {
      /* HANDLE AS DESIRED */
      console.log("The form loaded!");
    }
  }
});

sqpaymentform-basic.css


* {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body, html {
  color: #373F4A;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: normal;
}

iframe {
  margin: 0;
  padding: 0;
  border: 0;
}

button {
  border: 0;
}

hr {
  height: 1px;
  border: 0;
  background-color: #CCC;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}


#form-container {
  position: relative;
  width: 380px;
  margin: 0 auto;
  top: 50%;
  transform: translateY(-50%);
}

.label {
  font-size: 14px;
  font-weight: 500;
  line-height: 24px;
  letter-spacing: 0.5;
  text-transform: uppercase;
}

.third {
  float: left;
  width: calc((100% - 32px) / 3);
  padding: 0;
  margin: 0 16px 16px 0;
}

.third:last-of-type {
  margin-right: 0;
}

/* Define how SqPaymentForm iframes should look */
.sq-input {
  box-sizing: border-box;
  border: 1px solid #E0E2E3;
  border-radius: 4px;
  outline-offset: -2px;
  display: inline-block;
  -webkit-transition: border-color .2s ease-in-out, background .2s ease-in-out;
     -moz-transition: border-color .2s ease-in-out, background .2s ease-in-out;
      -ms-transition: border-color .2s ease-in-out, background .2s ease-in-out;
          transition: border-color .2s ease-in-out, background .2s ease-in-out;
}

/* Define how SqPaymentForm iframes should look when they have focus */
.sq-input--focus {
  border: 1px solid #4A90E2;
  background-color: rgba(74,144,226,0.02);
}


/* Define how SqPaymentForm iframes should look when they contain invalid values */
.sq-input--error {
  border: 1px solid #E02F2F;
  background-color: rgba(244,47,47,0.02);
}

#sq-card-number {
  margin-bottom: 16px;
}

/* Customize the "Pay with Credit Card" button */
.button-credit-card {
  width: 100%;
  height: 56px;
  margin-top: 10px;
  background: #4A90E2;
  border-radius: 4px;
  cursor: pointer;
  display: block;
  color: #FFFFFF;
  font-size: 16px;
  line-height: 24px;
  font-weight: 700;
  letter-spacing: 0;
  text-align: center;
  -webkit-transition: background .2s ease-in-out;
     -moz-transition: background .2s ease-in-out;
      -ms-transition: background .2s ease-in-out;
          transition: background .2s ease-in-out;
}

.button-credit-card:hover {
  background-color: #4281CB;
}


#error {
  width: 100%;
  margin-top: 16px;
  font-size: 14px;
  color: red;
  font-weight: 500;
  text-align: center;
  opacity: 0.8;
}

payment-process.php



require 'connect-php-sdk-master/vendor/autoload.php';

$access_token = 'ACCESS-TOKEN';
# setup authorization
\SquareConnect\Configuration::getDefaultConfiguration()->setAccessToken($access_token);
# create an instance of the Transaction API class
$transactions_api = new \SquareConnect\Api\TransactionsApi();
$location_id = 'LOCATION-ID';
$nonce = $_POST['nonce'];

$request_body = array (
    "card_nonce" => $nonce,
    # Monetary amounts are specified in the smallest unit of the applicable currency.
    # This amount is in cents. It's also hard-coded for $1.00, which isn't very useful.
    "amount_money" => array (
        "amount" => (int) $_POST['amount'],
        "currency" => "USD"
    ),
    # Every payment you process with the SDK must have a unique idempotency key.
    # If you're unsure whether a particular payment succeeded, you can reattempt
    # it with the same idempotency key without worrying about double charging
    # the buyer.
    "idempotency_key" => uniqid()
);

try {
    $result = $transactions_api->charge($location_id,  $request_body);
    // print_r($result);
	
	// echo '';
	if($result['transaction']['id']){
		echo 'Payment success!';
		echo "Transation ID: ".$result['transaction']['id']."";
	}
} catch (\SquareConnect\ApiException $e) {
    echo "Exception when calling TransactionApi->charge:";
    var_dump($e->getResponseBody());
}
?>

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