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File Content: `helper-powerkit-opt-in-forms.php`

<?php
/**
 * Helpers Opt-in Forms
 *
 * @package    Powerkit
 * @subpackage Modules/Helper
 */

/**
 * Get privacy text
 */
function powerkit_mailchimp_get_privacy_text() {
	return get_option( 'powerkit_mailchimp_privacy', esc_html__( 'By checking this box, you confirm that you have read and are agreeing to our terms of use regarding the storage of the data submitted through this form.', 'powerkit' ) );
}

/**
 * Get headers for mailchimp request.
 */
function powerkit_mailchimp_headers() {
	global $wp_version;

	$token = get_option( 'powerkit_mailchimp_token' );

	$headers                  = array();
	$headers['Authorization'] = 'apikey: ' . $token;
	$headers['Accept']        = 'application/json';
	$headers['Content-Type']  = 'application/json';
	$headers['User-Agent']    = 'DrewM/MailChimp-API/3.0 (github.com/drewm/mailchimp-api)';

	return $headers;
}

/**
 * Performs the underlying HTTP request. Not very exciting.
 *
 * @param string $http_verb The HTTP verb to use: get, post, put, patch, delete.
 * @param string $method    The API method to be called.
 * @param array  $data      Assoc array of parameters to be passed.
 */
function powerkit_mailchimp_request( $http_verb = 'GET', $method = 'lists', $data = array() ) {
	$token = get_option( 'powerkit_mailchimp_token' );

	if ( ! $token || false === strpos( $token, '-' ) ) {
		return false;
	}

	$url = 'https://<dc>.api.mailchimp.com/3.0/' . ltrim( $method, '/' );

	list(, $data_center ) = explode( '-', $token );

	$url = str_replace( '<dc>', $data_center, $url );

	$args = array(
		'url'       => $url,
		'method'    => $http_verb,
		'headers'   => powerkit_mailchimp_headers(),
		'timeout'   => 10,
		'sslverify' => apply_filters( 'powerkit_mailchimp_sslverify', true ),
	);

	if ( ! empty( $data ) ) {
		if ( in_array( $http_verb, array( 'GET', 'DELETE' ), true ) ) {
			$url = add_query_arg( $data, $url );
		} else {
			$args['body'] = wp_json_encode( $data );
		}
	}

	/**
	* Filter the request arguments for all requests generated by this class.
	*
	* @param array $args
	*/
	$args = apply_filters( 'powerkit_mailchimp_http_args', $args, $url );

	// Perform request.
	$response = wp_remote_request( $url, $args );

	// Instagram response.
	if ( ! is_wp_error( $response ) ) {
		$response = wp_remote_retrieve_body( $response );

		$response = json_decode( $response, true );
	} else {
		powerkit_alert_warning( esc_html__( 'This client has not been approved to access this resource.', 'powerkit' ) );
	}

	return $response;
}
File Content: helper-powerkit-opt-in-forms.php

File Content: `helper-powerkit-opt-in-forms.php`
