Stripe

Quform WordPress v2 DocumentationGuidesAdvancedStripe

Quform Stripe example

We hope to have a Stripe add-on available in the future, for now you can accept Stripe payments from forms using the guide below.

Step 1

Add an HTML element to the form, and in the settings for it enter the following code as the content.

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<div class="quform-label">
    <label class="quform-label-text" for="card-element">Credit or debit card<span class="quform-required">*</span></label>
</div>
<div id="card-element" style="padding:10px 0;"></div>
<div id="card-errors" role="alert" style="color:#c73412;"></div>
<input type="hidden" id="stripeToken" name="stripeToken">
<div class="quform-label">
    <label class="quform-label-text" for="card-element">Credit or debit card<span class="quform-required">*</span></label>
</div>
<div id="card-element" style="padding:10px 0;"></div>
<div id="card-errors" role="alert" style="color:#c73412;"></div>
<input type="hidden" id="stripeToken" name="stripeToken">

Step 2

Go to Forms → Settings → Custom CSS & JS and at the Custom JavaScript field add the following code.

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jQuery(function ($) {
    var $cardElement = $('#card-element');
 
    if ($cardElement.length && window.Stripe) {
        var stripe = Stripe('pk_test_key');        var elements = stripe.elements();
        var style = {
            base: {
                color: '#32325d',
                fontFamily: '"Helvetica Neue", Helvetica, sans-serif',
                fontSmoothing: 'antialiased',
                fontSize: '16px',
                '::placeholder': {
                    color: '#aab7c4'
                }
            },
            invalid: {
                color: '#fa755a',
                iconColor: '#fa755a'
            }
        };
 
        var card = elements.create('card', {style: style});
        card.mount($cardElement[0]);
 
        // Handle real-time validation errors from the card Element.
        card.addEventListener('change', function (event) {
            var displayError = document.getElementById('card-errors');
            if (event.error) {
                displayError.textContent = event.error.message;
            } else {
                displayError.textContent = '';
            }
        });
 
        var $form = $cardElement.closest('.quform-form');
 
        $form.off('submit').on('submit', function (e) {
            e.preventDefault();
 
            if ($cardElement.closest('.quform-element-page').hasClass('quform-current-page')) {
                stripe.createToken(card).then(function (result) {
                    if (result.error) {
                        // Inform the user if there was an error.
                        var errorElement = document.getElementById('card-errors');
                        errorElement.textContent = result.error.message;
                    } else {
                        $form.find('#stripeToken').val(result.token.id);
                        $form.data('quform').submit();
                    }
                });
            } else {
                $form.data('quform').submit();
            }
        });
 
        $form.on('quform:successStart', function () {
            card.clear();
        });
    }
});
jQuery(function ($) {
    var $cardElement = $('#card-element');

    if ($cardElement.length && window.Stripe) {
        var stripe = Stripe('pk_test_key');
        var elements = stripe.elements();
        var style = {
            base: {
                color: '#32325d',
                fontFamily: '"Helvetica Neue", Helvetica, sans-serif',
                fontSmoothing: 'antialiased',
                fontSize: '16px',
                '::placeholder': {
                    color: '#aab7c4'
                }
            },
            invalid: {
                color: '#fa755a',
                iconColor: '#fa755a'
            }
        };

        var card = elements.create('card', {style: style});
        card.mount($cardElement[0]);

        // Handle real-time validation errors from the card Element.
        card.addEventListener('change', function (event) {
            var displayError = document.getElementById('card-errors');
            if (event.error) {
                displayError.textContent = event.error.message;
            } else {
                displayError.textContent = '';
            }
        });

        var $form = $cardElement.closest('.quform-form');

        $form.off('submit').on('submit', function (e) {
            e.preventDefault();

            if ($cardElement.closest('.quform-element-page').hasClass('quform-current-page')) {
                stripe.createToken(card).then(function (result) {
                    if (result.error) {
                        // Inform the user if there was an error.
                        var errorElement = document.getElementById('card-errors');
                        errorElement.textContent = result.error.message;
                    } else {
                        $form.find('#stripeToken').val(result.token.id);
                        $form.data('quform').submit();
                    }
                });
            } else {
                $form.data('quform').submit();
            }
        });

        $form.on('quform:successStart', function () {
            card.clear();
        });
    }
});

Step 3

Download the quform-stripe plugin zip file. Unzip the file and open the quform-stripe/quform-stripe.php file in a text editor, then make the following changes.

  • On line 9, replace the number 1 with the form ID
  • On line 32, replace sk_test_key with your Stripe Secret key (get it from https://dashboard.stripe.com/account/apikeys)
  • On line 36, replace 2000 with the amount to charge in the currency’s smallest unit (e.g. cents)
  • On line 37, replace usd with the currency code (see https://stripe.com/docs/currencies)
  • On line 38, replace Example product the description for this charge
  • On line 41, replace 1_3 with the Email element unique ID (to associate the customer email address with the payment)

Finally, upload the quform-stripe folder to the web server at wp-content/plugins then go to the Plugins page within WordPress and activate the plugin Quform Stripe.

Show legacy instructions

Step 3

On your computer create a folder named quform-stripe and inside it create a file named quform-stripe.php

Open quform-stripe.php in any text editor and add the following code.

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<?php
 
/*
 * Plugin Name: Quform Stripe
 * Description: Stripe integration for Quform.
 * Version: 1.0.0
 */
 
add_filter('quform_post_validate_1', function (array $result, Quform_Form $form) {    require_once 'vendor/autoload.php';
 
    \Stripe\Stripe::setApiKey('sk_test_key'); 
    try {
        \Stripe\Charge::create([
            'currency' => 'usd',            'amount' => 2000,            'description' => 'Example product',            'source' => $_POST['stripeToken'],
            'metadata' => [
                'customer_email' => $form->getValueText('quform_1_3')
            ]
        ]);
    } catch (Exception $e) {
        $result = array(
            'type' => 'error',
            'error' => array(
                'enabled' => true,
                'title' => '',
                'content' => $e->getMessage()
            )
        );
    }
 
    return $result;
}, 10, 2);
 
add_filter('quform_post_set_form_values_1', function (array $result, Quform_Form $form) {    if (!isset($_POST['stripeToken']) || ! Quform::isNonEmptyString($_POST['stripeToken'])) {
        $result = array(
            'type' => 'error',
            'error' => array(
                'enabled' => true,
                'title' => '',
                'content' => 'Please enter your card details to continue'
            )
        );
 
        // No JS response
        $form->setConfig(array(
            'errorEnabled' => true,
            'errorTitle' => '',
            'errorContent' => 'Please enable JavaScript and enter your card details to continue'
        ));
    }
 
    return $result;
}, 10, 2);
 
add_action('wp_enqueue_scripts', function () {
    wp_enqueue_script('stripe', 'https://js.stripe.com/v3/', array(), false, true);
});
<?php

/*
 * Plugin Name: Quform Stripe
 * Description: Stripe integration for Quform.
 * Version: 1.0.0
 */

add_filter('quform_post_validate_1', function (array $result, Quform_Form $form) {
    require_once 'vendor/autoload.php';

    \Stripe\Stripe::setApiKey('sk_test_key');

    try {
        \Stripe\Charge::create([
            'currency' => 'usd',
            'amount' => 2000,
            'description' => 'Example product',
            'source' => $_POST['stripeToken'],
            'metadata' => [
                'customer_email' => $form->getValueText('quform_1_3')
            ]
        ]);
    } catch (Exception $e) {
        $result = array(
            'type' => 'error',
            'error' => array(
                'enabled' => true,
                'title' => '',
                'content' => $e->getMessage()
            )
        );
    }

    return $result;
}, 10, 2);

add_filter('quform_post_set_form_values_1', function (array $result, Quform_Form $form) {
    if (!isset($_POST['stripeToken']) || ! Quform::isNonEmptyString($_POST['stripeToken'])) {
        $result = array(
            'type' => 'error',
            'error' => array(
                'enabled' => true,
                'title' => '',
                'content' => 'Please enter your card details to continue'
            )
        );

        // No JS response
        $form->setConfig(array(
            'errorEnabled' => true,
            'errorTitle' => '',
            'errorContent' => 'Please enable JavaScript and enter your card details to continue'
        ));
    }

    return $result;
}, 10, 2);

add_action('wp_enqueue_scripts', function () {
    wp_enqueue_script('stripe', 'https://js.stripe.com/v3/', array(), false, true);
});
  • On lines 9 and 38, replace the number 1 with the form ID
  • On line 12, replace sk_test_key with your Stripe Secret key (get it from https://dashboard.stripe.com/account/apikeys)
  • On line 16, set the currency code (see https://stripe.com/docs/currencies)
  • On line 17, set the amount to charge in the currency’s smallest unit (e.g. cents)
  • On line 18, set the description for this charge
  • On line 21, replace 1_3 with the Email element unique ID (to associate the customer email address with the payment)

Step 4

We’ll now need to install the PHP library for the Stripe API using Composer. Once you’ve installed composer, open a terminal window (or run cmd on Windows) and navigate to the quform-stripe folder you created in Step 1 then run this command:

composer require stripe/stripe-php

This will install all required files into the vendor folder within the quform-stripe folder.

Finally, upload the quform-stripe folder to the web server at wp-content/plugins then go to the Plugins page within WordPress and activate the plugin Quform Stripe.

Using the Stripe PaymentIntents API

Step 1

Add an HTML element to the form, and in the settings for it enter the following code as the content.

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<div class="quform-label">
    <label class="quform-label-text" for="card-element">Credit or debit card<span class="quform-required">*</span></label>
</div>
<div id="card-element" class="quform-field-text"></div>
<div id="card-errors" role="alert" style="color:#c73412;"></div>
<input type="hidden" id="stripe_payment_method_id" name="stripe_payment_method_id">
<input type="hidden" id="stripe_payment_intent_id" name="stripe_payment_intent_id">
<div class="quform-label">
    <label class="quform-label-text" for="card-element">Credit or debit card<span class="quform-required">*</span></label>
</div>
<div id="card-element" class="quform-field-text"></div>
<div id="card-errors" role="alert" style="color:#c73412;"></div>
<input type="hidden" id="stripe_payment_method_id" name="stripe_payment_method_id">
<input type="hidden" id="stripe_payment_intent_id" name="stripe_payment_intent_id">

Step 2

Go to Forms → Settings → Custom CSS & JS and at the Custom JavaScript field add the following code.

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jQuery(function ($) {
    var $cardElement = $('#card-element');
 
    if ($cardElement.length && window.Stripe) {
        var stripe = Stripe('pk_test_key');        var elements = stripe.elements();
        var style = {
            base: {
                color: '#32325d',
                fontFamily: '"Helvetica Neue", Helvetica, sans-serif',
                fontSmoothing: 'antialiased',
                fontSize: '16px',
                '::placeholder': {
                    color: '#aab7c4'
                }
            },
            invalid: {
                color: '#fa755a',
                iconColor: '#fa755a'
            }
        };
 
        var card = elements.create('card', {style: style});
        card.mount($cardElement[0]);
 
        // Handle real-time validation errors from the card Element.
        card.addEventListener('change', function (event) {
            var displayError = document.getElementById('card-errors');
            if (event.error) {
                displayError.textContent = event.error.message;
            } else {
                displayError.textContent = '';
            }
        });
 
        var $form = $cardElement.closest('.quform-form');
 
        $form.off('submit').on('submit', function (e) {
            e.preventDefault();
 
            if ($cardElement.closest('.quform-element-page').hasClass('quform-current-page')) {
                stripe.createPaymentMethod({ type: 'card', card: card }).then(function (result) {
                    if (result.error) {
                        // Inform the user if there was an error.
                        var errorElement = document.getElementById('card-errors');
                        errorElement.textContent = result.error.message;
                    } else {
                        $form.find('#stripe_payment_method_id').val(result.paymentMethod.id);
                        $form.data('quform').submit();
                    }
                });
            } else {
                $form.data('quform').submit();
            }
        });
 
        $form.on('quform:errorEnd', function (e, form, response) {
            if(response.requires_action && response.payment_intent_client_secret && response.requires_action === 'handleCardAction') {
                stripe.handleCardAction(response.payment_intent_client_secret).then(function (result) {
                    if (result.error) {
                        // Inform the user if there was an error.
                        var errorElement = document.getElementById('card-errors');
                        errorElement.textContent = result.error.message;
                    } else {
                        $form.find('#stripe_payment_intent_id').val(result.paymentIntent.id);
                        $form.data('quform').submit();
                    }
                });
            }
        });
 
        $form.on('quform:successStart', function () {
            $form.find('#stripe_payment_method_id').val('');
            $form.find('#stripe_payment_intent_id').val('');
            card.clear();
        });
    }
});
jQuery(function ($) {
    var $cardElement = $('#card-element');

    if ($cardElement.length && window.Stripe) {
        var stripe = Stripe('pk_test_key');
        var elements = stripe.elements();
        var style = {
            base: {
                color: '#32325d',
                fontFamily: '"Helvetica Neue", Helvetica, sans-serif',
                fontSmoothing: 'antialiased',
                fontSize: '16px',
                '::placeholder': {
                    color: '#aab7c4'
                }
            },
            invalid: {
                color: '#fa755a',
                iconColor: '#fa755a'
            }
        };

        var card = elements.create('card', {style: style});
        card.mount($cardElement[0]);

        // Handle real-time validation errors from the card Element.
        card.addEventListener('change', function (event) {
            var displayError = document.getElementById('card-errors');
            if (event.error) {
                displayError.textContent = event.error.message;
            } else {
                displayError.textContent = '';
            }
        });

        var $form = $cardElement.closest('.quform-form');

        $form.off('submit').on('submit', function (e) {
            e.preventDefault();

            if ($cardElement.closest('.quform-element-page').hasClass('quform-current-page')) {
                stripe.createPaymentMethod({ type: 'card', card: card }).then(function (result) {
                    if (result.error) {
                        // Inform the user if there was an error.
                        var errorElement = document.getElementById('card-errors');
                        errorElement.textContent = result.error.message;
                    } else {
                        $form.find('#stripe_payment_method_id').val(result.paymentMethod.id);
                        $form.data('quform').submit();
                    }
                });
            } else {
                $form.data('quform').submit();
            }
        });

        $form.on('quform:errorEnd', function (e, form, response) {
            if(response.requires_action && response.payment_intent_client_secret && response.requires_action === 'handleCardAction') {
                stripe.handleCardAction(response.payment_intent_client_secret).then(function (result) {
                    if (result.error) {
                        // Inform the user if there was an error.
                        var errorElement = document.getElementById('card-errors');
                        errorElement.textContent = result.error.message;
                    } else {
                        $form.find('#stripe_payment_intent_id').val(result.paymentIntent.id);
                        $form.data('quform').submit();
                    }
                });
            }
        });

        $form.on('quform:successStart', function () {
            $form.find('#stripe_payment_method_id').val('');
            $form.find('#stripe_payment_intent_id').val('');
            card.clear();
        });
    }
});

Step 3

Download the quform-stripe plugin zip file. Unzip the file and open the quform-stripe/quform-stripe.php file in a text editor, then make the following changes.

  • On line 9, replace the number 1 with the form ID
  • On line 33, replace sk_test_key with your Stripe Secret key (get it from https://dashboard.stripe.com/account/apikeys)
  • On line 41, replace 2000 with the amount to charge in the currency’s smallest unit (e.g. cents)
  • On line 42, replace usd with the currency code (see https://stripe.com/docs/currencies)
  • On line 43, replace Example product the description for this charge
  • On lines 48 and 50, replace 1_3 with the Email element unique ID (to associate the customer email address with the payment)

Finally, upload the quform-stripe folder to the web server at wp-content/plugins then go to the Plugins page within WordPress and activate the plugin Quform Stripe.

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