フォームプラグインのContact form 7にキントーンとの連携などできないか、独自のカスタムができるのか調べてみる

/wp-json/contact-form-7/v1/contact-forms/{postId}/feedback

フォームの送信先はAjaxでここにアクセスしてた。

ここで作成されたカスタムエンドポイント
plugins/contact-form-7/includes/rest-api.php

register_rest_route( $namespace,
		'/contact-forms/(?P<id>\d+)/feedback',
		array(
			array(
				'methods' => WP_REST_Server::CREATABLE,
				'callback' => 'wpcf7_rest_create_feedback',
				'permission_callback' => '__return_true',
			),
		)
	);

function wpcf7_rest_create_feedback( WP_REST_Request $request ) {
	$url_params = $request->get_url_params();

	$item = null;

	if ( ! empty( $url_params['id'] ) ) {
		$item = wpcf7_contact_form( $url_params['id'] );
	}

	if ( ! $item ) {
		return new WP_Error( 'wpcf7_not_found',
			__( "The requested contact form was not found.", 'contact-form-7' ),
			array( 'status' => 404 )
		);
	}

	$result = $item->submit();

	$unit_tag = $request->get_param( '_wpcf7_unit_tag' );

	$response = array(
		'into' => '#' . wpcf7_sanitize_unit_tag( $unit_tag ),
		'status' => $result['status'],
		'message' => $result['message'],
		'posted_data_hash' => $result['posted_data_hash'],
	);

contact-form.php

public function submit( $args = '' ) {
		$args = wp_parse_args( $args, array(
			'skip_mail' =>
				( $this->in_demo_mode()
				|| $this->is_true( 'skip_mail' )
				|| ! empty( $this->skip_mail ) ),
		) );

		if ( $this->is_true( 'subscribers_only' )
		and ! current_user_can( 'wpcf7_submit', $this->id() ) ) {
			$result = array(
				'contact_form_id' => $this->id(),
				'status' => 'error',
				'message' => __(
					"This contact form is available only for logged in users.",
					'contact-form-7'
				),
			);

			return $result;
		}

		$submission = WPCF7_Submission::get_instance( $this, array(
			'skip_mail' => $args['skip_mail'],
		) );

		$result = array(
			'contact_form_id' => $this->id(),
			'status' => $submission->get_status(),
			'message' => $submission->get_response(),
			'demo_mode' => $this->in_demo_mode(),
		);

		if ( $submission->is( 'validation_failed' ) ) {
			$result['invalid_fields'] = $submission->get_invalid_fields();
		}

		switch ( $submission->get_status() ) {
			case 'init':
			case 'validation_failed':
			case 'acceptance_missing':
			case 'spam':
				$result['posted_data_hash'] = '';
				break;
			default:
				$result['posted_data_hash'] = $submission->get_posted_data_hash();
				break;
		}

		do_action( 'wpcf7_submit', $this, $result );

		return $result;
	}