Form_Frontend_Submission_Handler::maybe_handle_form_submission()

	public function maybe_handle_form_submission() {
		if ( ! isset( $_POST['torro_submission'] ) ) {
			return;
		}

		$data = wp_unslash( $_POST['torro_submission'] );

		$context = $this->detect_request_form_and_submission( $data );
		if ( is_wp_error( $context ) ) {
			// Always die when one of these strange errors happens.
			wp_die( $context->get_error_message(), __( 'Form Submission Error', 'torro-forms' ), 400 );
		}

		$form       = $context['form'];
		$submission = $context['submission'];

		$verified = $this->verify_request( $data, $form, $submission );
		if ( ! $verified || is_wp_error( $verified ) ) {
			if ( ! $verified ) {
				$verified = new WP_Error( 'cannot_verify_request', __( 'The request could not be verified.', 'torro-forms' ) );
			}

			// Die only if the form error could not be set.
			if ( ! $this->set_form_error( $form, $verified ) ) {
				wp_die( $verified->get_error_message(), __( 'Form Submission Error', 'torro-forms' ), 403 );
			}
		} else {
			if ( ! $submission ) {
				$submission = $this->create_new_submission( $form, $data );
			}

			$this->handle_form_submission( $form, $submission, $data );
		}

		$redirect_url = ! empty( $data['original_form_id'] ) ? get_permalink( absint( $data['original_form_id'] ) ) : get_permalink( $form->id );

		/**
		 * Filters the URL to redirect the user to after a form submission request has been processed.
		 *
		 * If a submission is applicable, its query variable will be appended.
		 *
		 * @since 1.0.0
		 *
		 * @param string $redirect_url URL to redirect to. Default is the original form URL.
		 * @param Form   $form         Form object.
		 */
		$redirect_url = apply_filters( "{$this->form_manager->get_prefix()}handle_form_submission_redirect_url", $redirect_url, $form );

		// Append submission ID if the URL belongs to the site.
		if ( $submission && ! empty( $submission->id ) && 0 === strpos( $redirect_url, home_url() ) ) {
			$redirect_url = add_query_arg( 'torro_submission_id', $submission->id, $redirect_url );
		}

		wp_redirect( $redirect_url );
		exit;
	}