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Editing: _MailPoet3.php

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<?php

/**
 * Wrapper for MailPoet's API.
 *
 * @since   3.0.76
 *
 * @package ET\Core\API\Email
 */
class ET_Core_API_Email_MailPoet3 extends ET_Core_API_Email_Provider {

public static $PLUGIN_REQUIRED;

/**
	 * @inheritDoc
	 */
	public $name = 'MailPoet';

/**
	 * @inheritDoc
	 */
	public $slug = 'mailpoet';

/**
	 * @inheritDoc
	 */
	public $custom_fields_scope = 'account';

public function __construct( $owner = '', $account_name = '', $api_key = '' ) {
		parent::__construct( $owner, $account_name, $api_key );

if ( null === self::$PLUGIN_REQUIRED ) {
			self::$PLUGIN_REQUIRED = esc_html__( 'MailPoet plugin is either not installed or not activated.', 'et_core' );
		}
	}

protected function _fetch_custom_fields( $list_id = '', $list = array() ) {
		static $processed = null;

if ( is_null( $processed ) ) {
			$fields    = \MailPoet\API\API::MP( 'v1' )->getSubscriberFields();
			$processed = array();

foreach ( $fields as $field ) {
				$field_id   = $field['id'];
				$field_name = $field['name'];

if ( in_array( $field_id, array( 'email', 'first_name', 'last_name' ) ) ) {
					continue;
				}

$processed[ $field_id ] = array(
					'field_id' => $field_id,
					'name'     => $field_name,
					'type'     => 'any',
				);
			}
		}

return $processed;
	}

protected function _process_custom_fields( $args ) {
		if ( ! isset( $args['custom_fields'] ) ) {
			return $args;
		}

$custom_fields = $args['custom_fields'];

$required_fields = $this->_get_required_custom_fields();

// Filter missing required custom field.
		$missing_fields = array_diff( $required_fields, array_keys( $custom_fields ) );

// Fill-up missing required custom fields with dummy content and merge with available ones.
		// This is required because of how MailPoet API validates the custom fields currently
		// and there's no filters available to alter this behavior right now.
		$fields = array_merge( $custom_fields, array_fill_keys( $missing_fields, 'n/a' ) );

unset( $args['custom_fields'] );

foreach ( $fields as $field_id => $value ) {
			if ( is_array( $value ) && $value ) {
				// This is a multiple choice field (eg. checkbox, radio, select)
				$value = array_keys( $value );

if ( count( $value ) > 1 ) {
					$value = implode( ',', $value );
				} else {
					$value = array_pop( $value );
				}
			}

self::$_->array_set( $args, $field_id, $value );
		}

return $args;
	}

/**
	 * Get required custom fields.
	 *
	 * @return $required_fields
	 */
	protected function _get_required_custom_fields() {
		$fields          = \MailPoet\API\API::MP( 'v1' )->getSubscriberFields();
		$required_fields = [];

foreach ( $fields as $field ) {
			// Custom field ids have `cf_` prefix. Also we need only the required ones.
			if ( false !== strpos( $field['id'], 'cf_' ) && $field['params']['required'] ) {
				$required_fields[] = $field['id'];
			}
		}

return $required_fields;
	}

/**
	 * @inheritDoc
	 */
	public function get_account_fields() {
		return array();
	}

/**
	 * @inheritDoc
	 */
	public function get_data_keymap( $keymap = array() ) {
		$keymap = array(
			'list'       => array(
				'list_id' => 'id',
				'name'    => 'name',
			),
			'subscriber' => array(
				'name'          => 'first_name',
				'last_name'     => 'last_name',
				'email'         => 'email',
				'custom_fields' => 'custom_fields',
			),
		);

return parent::get_data_keymap( $keymap );
	}

/**
	 * @inheritDoc
	 */
	public function fetch_subscriber_lists() {
		if ( ! class_exists( '\MailPoet\API\API' ) ) {
			return self::$PLUGIN_REQUIRED;
		}

$data = \MailPoet\API\API::MP( 'v1' )->getLists();

if ( ! empty( $data ) ) {
			$this->data['lists'] = $this->_process_subscriber_lists( $data );

$list                        = is_array( $data ) ? array_shift( $data ) : array();
			$this->data['custom_fields'] = $this->_fetch_custom_fields( '', $list );
		}

$this->data['is_authorized'] = true;

$this->save_data();

return array( 'success' => $this->data );
	}

/**
	 * @inheritDoc
	 */
	public function subscribe( $args, $url = '' ) {
		if ( ! class_exists( '\MailPoet\API\API' ) ) {
			ET_Core_Logger::error( self::$PLUGIN_REQUIRED );

return esc_html__( 'An error occurred. Please try again later.', 'et_core' );
		}

$subscriber      = array();
		$args            = et_core_sanitized_previously( $args );
		$subscriber_data = $this->transform_data_to_provider_format( $args, 'subscriber' );
		$subscriber_data = $this->_process_custom_fields( $subscriber_data );
		$subscriber_data = self::$_->array_flatten( $subscriber_data );
		$result          = 'success';
		$lists           = array( $args['list_id'] );

unset( $subscriber_data['custom_fields'] );

/**
		 * Check if the subscriber with this email already exists.
		 */
		try {
			$subscriber = \MailPoet\API\API::MP( 'v1' )->getSubscriber( $subscriber_data['email'] );
		} catch ( \Exception $e ) {
			$subscriber = array();
		}

/**
		 * If subscriber is not found, add as a new subscriber. Otherwise, add existing subscriber to the lists.
		 */
		if ( empty( $subscriber ) ) {
			try {
				\MailPoet\API\API::MP( 'v1' )->addSubscriber( $subscriber_data, $lists );
			} catch ( Exception $exception ) {
				$result = $exception->getMessage();
			}
		} else {
			try {
				\MailPoet\API\API::MP( 'v1' )->subscribeToLists( $subscriber['id'], $lists );
			} catch ( Exception $exception ) {
				$result = $exception->getMessage();
			}
		}

return $result;
	}
}

Editing: _MailPoet3.php

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