Enables the credit card fields for Gravity Forms and provides a function to get the credit card details which are not available through the filter $form or $entry

Gravity Forms Get Credit Card Details

<?php
/**
 * Enable CC Field & Send through email or the GF Webhooks Addon.
 *
 * @package GF - DK Extended.
 */

/**
 * Security: Block direct access.
 */
defined( 'ABSPATH' ) || die( 'No script kiddies please!' );

/**
 * This originated from a GitHub Gist. Which you can see from the fork.
 *
 * @link https://gist.github.com/DeveloperWil/2a380bf7e428cd962084
 */




// Enable the GF Credit Card field for admin and front-end.
add_action( 'gform_enable_credit_card_field', '__return_true', 11 );

/**
 * Email encoded card details when the form is submitted.
 *
 * Note: You may want to use 'gform_pre_submission' instead of 'gform_after_submission' if altering fields before any notifications/webhooks/etc!
 *
 * @param Object $entry The entry that was just created.
 * @param Object $form  The current form.
 */
function email_encoded_cc( $entry, $form ) {
	// This should be a required field in which it will always exist.
	$cc_fields = GFCommon::get_fields_by_type( $form, array('creditcard') )[0];

	$card_number      = rgpost( "input_{$cc_fields['id']}_1" );
	$expiration_date  = rgpost( "input_{$cc_fields['id']}_2" );
		$expire_month = ( 10 > (int) $expiration_date[0] ) ? '0' . $expiration_date[0] : $expiration_date[0];
		$expire_year  = $expiration_date[1];
	$security_code    = rgpost( "input_{$cc_fields['id']}_3" );
	$card_name        = rgpost( "input_{$cc_fields['id']}_5" );
	$cc_detail_string = "CardName: $card_name CardNum: $card_number CardExp: $expire_month/$expire_year CardCCV: $security_code";

	// Remember base 64 is not encryption - just encoding!
	$encoded_cc_detail_string = base64_encode( $cc_detail_string );
	// Send encoded CC details via email. (Sending this info by email really is a bad idea since email isn't secure!)
	$to      = '[email protected]'; // Email here.
	$subject = '[Website Name] Submission';
	$body    = $cc_detail_string;     // Encoded string.
	$message = "Here are the CC details:\n$body";
	$from    = '[email protected]';
	$headers = "From:" . $from;
	// Send message.
	mail( $to, $subject, $message, $headers );
}
add_action( 'gform_after_submission', 'email_encoded_cc', 10, 2 );





/**
 * ----------------------------------------------------------------
 * ----------------------------------------------------------------
 * Using with GF Webhooks Addon instead.
 * ----------------------------------------------------------------
 * ----------------------------------------------------------------
 */

/**
 * Manipulate Webhook values on submit after validation occurs.
 *
 * @param Object $form The current form.
 */
function pre_submission_handler( $form ) {
	/**
	 * Check for form ID #18 submission.
	 */
	if ( 18 === $form['id'] ) {
		// Update CC info to additional fields, since GF isn't passing them by default.
		// This will automatically grab the CC field and the fields ID for pulling data.
		$cc_fields = GFCommon::get_fields_by_type( $form, array( 'creditcard' ) )[0];

		// $card_number      = rgpost( "input_{$cc_fields['id']}_1" );                              // GF collects this field without issue.
		// $card_type        = $cc_fields['creditCards'][ rgpost( "input_{$cc_fields['id']}_3" ) ]; // GF collects this field without issue.
		$exp_date_arr = rgpost( "input_{$cc_fields['id']}_2" );
		// Adjust month.
		$exp_month         = ( 10 > (int) $exp_date_arr[0] ) ? '0' . $exp_date_arr[0] : $exp_date_arr[0];
		// Update hidden fields (that you will need to add to your form) that the Webhooks Addon can actually reference!
		$_POST['input_39'] = $exp_month . '/' . $exp_date_arr[1];
		$_POST['input_40'] = rgpost( "input_{$cc_fields['id']}_3" );
		$_POST['input_41'] = rgpost( "input_{$cc_fields['id']}_5" );
	}
}
add_action( 'gform_pre_submission', 'pre_submission_handler' );


/**
 * ----------------------------------------------------------------
 * ----------------------------------------------------------------
 * Finally, don't forget to wipe these fields with a 'gform_after_submission'!
 * ----------------------------------------------------------------
 * ----------------------------------------------------------------
 */

/**
 * Gravity Forms:
 * - Remove submitted data from saving to site form entries.
 */
add_action(
	'gform_after_submission',
	/**
	 * Overwrite specific field entry.
	 * - Remove Social Security Numbers from the local GF database.
	 *
	 * @param Object $entry The entry that was just created.
	 * @param Object $form  The current form.
	 */
	function( $entry, $form ) {
		// Note: This code is only checking GF form ID: 18!
		if ( '18' === $entry['form_id'] ) {
			/**
			 * Update Entry Field.
			 *
			 * @param int                   $entry_id   The ID of the entry the field or input value is to be updated for.
			 * @param int|string            $input_id   The ID of the field or input the value is to be updated for.
			 * @param null|int|string|float $value      The new value of the field or input.
			 * @param string                $item_index The item index if the field or input is a child of a Repeater field.
			 */
			// NOTE: GF automatically obfuscates the CC number. However, we will need to obfuscate the fields we add around the CC Number.
			// Remove CC Exp Data.
			GFAPI::update_entry_field( $entry['id'], 39, 'data_not_stored' );
			// Remove CC CCV Data.
			GFAPI::update_entry_field( $entry['id'], 40, 'data_not_stored' );
			// Remove CC Card Name Data.
			GFAPI::update_entry_field( $entry['id'], 41, 'data_not_stored' );
		}
	},
	10,
	2
);