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Editing: ConstantContact.php

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<?php

/**
 * Wrapper for ConstantContact's API.
 *
 * @since   3.0.75
 *
 * @package ET\Core\API\Email
 */
class ET_Core_API_Email_ConstantContact extends ET_Core_API_Email_Provider {

/**
	 * @inheritDoc
	 */
	public $BASE_URL = 'https://api.constantcontact.com/v2';

/**
	 * @inheritDoc
	 */
	public $LISTS_URL = 'https://api.constantcontact.com/v2/lists';

/**
	 * @inheritDoc
	 */
	public $SUBSCRIBE_URL = 'https://api.constantcontact.com/v2/contacts';

/**
	 * @inheritDoc
	 */
	public $SUBSCRIBERS_URL = 'https://api.constantcontact.com/v2/contacts';

protected $_subscriber;

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

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

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

/**
	 * ET_Core_API_Email_ConstantContact constructor.
	 *
	 * @inheritDoc
	 */
	public function __construct( $owner = '', $account_name = '', $api_key = '' ) {
		parent::__construct( $owner, $account_name, $api_key );

$this->_maybe_set_custom_headers();
	}

protected function _create_subscriber_data_array( $args ) {
		return $this->transform_data_to_provider_format( $args, 'subscriber' );
	}

protected function _fetch_custom_fields( $list_id = '', $list = array() ) {
		$fields = array();

foreach ( range( 1, 15 ) as $i ) {
			$fields["custom_field_{$i}"] = array(
				'field_id' => "custom_field_{$i}",
				'name'     => "custom_field_{$i}",
				'type'     => 'any',
			);
		}

return $fields;
	}

protected function _get_list_from_subscriber( $subscriber, $list_id ) {
		if ( ! isset( $subscriber['lists'] ) ) {
			return false;
		}

foreach ( $subscriber['lists'] as &$list ) {
			if ( $list['id'] === $list_id ) {
				return $list;
			}
		}

return false;
	}

protected function _maybe_set_custom_headers() {
		if ( empty( $this->custom_headers ) && isset( $this->data['token'] ) ) {
			$this->custom_headers = array(
				'Authorization' => 'Bearer ' . sanitize_text_field( $this->data['token'] ),
			);
		}
	}

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

$fields           = $args['custom_fields'];
		$processed_fields = array();

unset( $args['custom_fields'], $this->_subscriber['custom_fields_unprocessed'] );

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

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

$processed_fields[] = array(
				'name'  => $field_id,
				'value' => $value,
			);
		}

if ( isset( $this->_subscriber['custom_fields'] ) ) {
			$processed_fields = array_merge( $processed_fields, $this->_subscriber['custom_fields'] );
		}

$this->_subscriber['custom_fields'] = array_unique( $processed_fields, SORT_REGULAR );

return $args;
	}

/**
	 * @inheritDoc
	 */
	public function get_account_fields() {
		return array(
			'api_key' => array(
				'label' => esc_html__( 'API Key', 'et_core' ),
			),
			'token'   => array(
				'label' => esc_html__( 'Access Token', 'et_core' ),
			),
		);
	}

/**
	 * @inheritDoc
	 */
	public function get_data_keymap( $keymap = array() ) {
		$keymap = array(
			'list'         => array(
				'list_id'           => 'id',
				'name'              => 'name',
				'subscribers_count' => 'contact_count',
			),
			'subscriber'   => array(
				'name'          => 'first_name',
				'last_name'     => 'last_name',
				'email'         => 'email_addresses.[0].email_address',
				'list_id'       => 'lists.[0].id',
				'custom_fields' => 'custom_fields_unprocessed',
			),
			'error'        => array(
				'error_message' => '[0].error_message',
			),
			'custom_field' => array(
				'field_id' => 'name',
				'name'     => 'name',
			),
		);

return parent::get_data_keymap( $keymap );
	}

public function get_subscriber( $email ) {
		$url = add_query_arg( 'email', $email, $this->SUBSCRIBERS_URL );

$this->prepare_request( $url, 'GET', false );
		$this->make_remote_request();

if ( $this->response->ERROR || ! isset( $this->response->DATA['results'] ) ) {
			return array();
		}

return $this->response->DATA['results'];
	}

/**
	 * @inheritDoc
	 */
	public function fetch_subscriber_lists() {
		if ( empty( $this->data['api_key'] ) || empty( $this->data['token'] ) ) {
			return $this->API_KEY_REQUIRED;
		}

$this->_maybe_set_custom_headers();

$this->response_data_key = false;

$this->LISTS_URL = add_query_arg( 'api_key', $this->data['api_key'], $this->LISTS_URL );

return parent::fetch_subscriber_lists();
	}

/**
	 * @inheritDoc
	 */
	public function subscribe( $args, $url = '' ) {
		$this->SUBSCRIBERS_URL = add_query_arg( 'api_key', $this->data['api_key'], $this->SUBSCRIBERS_URL );
		$result                = null;
		$args['list_id']       = (string) $args['list_id'];

$subscriber = $this->get_subscriber( $args['email'] );
		$subscriber = $subscriber ? $subscriber[0] : $subscriber;

$query_args = array( 'api_key' => $this->data['api_key'], 'action_by' => 'ACTION_BY_VISITOR' );

if ( $subscriber ) {
			if ( $list = $this->_get_list_from_subscriber( $subscriber, $args['list_id'] ) ) {
				$result = 'success';
			} else {
				$subscriber['lists'][] = array( 'id' => $args['list_id'] );

$this->_subscriber = &$subscriber;

$args = $this->_process_custom_fields( $args );

$url = add_query_arg( $query_args, "{$this->SUBSCRIBE_URL}/{$subscriber['id']}" );

$this->prepare_request( $url, 'PUT', false, $subscriber, true );
			}

} else {
			$url        = add_query_arg( $query_args, $this->SUBSCRIBE_URL );
			$subscriber = $this->_create_subscriber_data_array( $args );

$this->_subscriber = &$subscriber;

$args = $this->_process_custom_fields( $args );

$this->prepare_request( $url, 'POST', false, $subscriber, true );
		}

if ( 'success' !== $result ) {
			$result = parent::subscribe( $args, $this->SUBSCRIBE_URL );
		}

return $result;
	}
}

Editing: ConstantContact.php

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