public function ajax_save_credentials() {
		if ( empty( $_POST['tribe_credentials_which'] ) ) {
			$data = array(
				'message' => __( 'Invalid credential save request', 'the-events-calendar' ),
			);

			wp_send_json_error( $data );
		}

		$which = $_POST['tribe_credentials_which'];

		if ( empty( $_POST['_wpnonce'] ) || ! wp_verify_nonce( $_POST['_wpnonce'], "tribe-save-{$which}-credentials" ) ) {
			$data = array(
				'message' => __( 'Invalid credential save nonce', 'the-events-calendar' ),
			);

			wp_send_json_error( $data );
		}

		if ( 'meetup' === $which ) {
			if ( empty( $_POST['meetup_api_key'] ) ) {
				$data = array(
					'message' => __( 'The Meetup API key is required.', 'the-events-calendar' ),
				);

				wp_send_json_error( $data );
			}

			tribe_update_option( 'meetup_api_key', trim( preg_replace( '/[^a-zA-Z0-9]/', '', $_POST['meetup_api_key'] ) ) );

			$data = array(
				'message' => __( 'Credentials have been saved', 'the-events-calendar' ),
			);

			wp_send_json_success( $data );
		}

		$data = array(
			'message' => __( 'Unable to save credentials', 'the-events-calendar' ),
		);

		wp_send_json_error( $data );
	}