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Edit File: doi-helper.php

<?php /** * Double Opt-In Helper module * * @link https://contactform7.com/doi-helper/ */ add_action( 'wpcf7_doi', 'wpcf7_doihelper_start_session', 10, 3 ); /** * Starts a double opt-in session. */ function wpcf7_doihelper_start_session( $agent_name, $args, &$token ) { if ( isset( $token ) ) { return; } if ( ! function_exists( 'doihelper_start_session' ) ) { return; } $submission = WPCF7_Submission::get_instance(); if ( ! $submission ) { return; } $contact_form = $submission->get_contact_form(); $do_doi = apply_filters( 'wpcf7_do_doi', ! $contact_form->is_false( 'doi' ), $agent_name, $args ); if ( ! $do_doi ) { return; } $token = doihelper_start_session( $agent_name, $args ); }