[Craig Haller]

Add a radio with Yes and No and call the meta _give_want_newsletter then put this code in a snippet or functions.php

/**
See give/includes/payments/functions.php
* Fires while inserting payments.
* @param int $payment_id The payment ID.
* @param array $payment_data Arguments passed.
*/

function bdn_give_insert_payment( $payment_ID, $payment_data ) {

if ( get_post_meta( $payment_ID, '_give_want_newsletter', true ) != 'Yes' ) return;

// https://github.com/TheNewsletterPlugin/newsletter-codesamples/blob/master/subscribe.php
// Please, refer to the TNP_Subscription and TNP_Subscription_Data classes of Newsletter.
// 'email' => NULL,'name' => NULL,'surname' => NULL,'sex' => NULL,'language' => '','referrer' => NULL,'http_referrer' => NULL,
// 'ip' => NULL,'country' => NULL,'region' => NULL,'city' => NULL,'lists' =>

// Ok, at least Newsletter should be there
if (!class_exists('newsletter')) return;
// Optinally a version check (you should use version_compare())
if (NEWSLETTER_VERSION < '7.4.0') return;
// This is the object representing a subscription (data and properties) to be
// sent to Newsletter. The default one is prefilled with some attributes reflecting
// the plugin settings (opt-mode, pre-assigned lists, ...).
$subscription = NewsletterSubscription::instance()->get_default_subscription();
// Start filling in the subscriber data.
$subscription->data->name = get_post_meta( $payment_ID, '_give_donor_billing_first_name', true );
$subscription->data->surname = get_post_meta( $payment_ID, '_give_donor_billing_last_name', true );
$subscription->data->email = get_post_meta( $payment_ID, '_give_payment_donor_email', true ); // Of course, mandatory.

// Lists: you integration could optionally add the subscriber to specific list. This is
// useful to trigger other actions in Newsletter, for example starting an autoresponder series.
// You should create a configuration side for your plugin where the administrator can select which

// lists to activate (from 1 to 40).
$subscription->data->lists['1'] = 1; // Activate list 1.
// $subscription->data->lists['2'] = 0; // Deactivate list 2.

// Subscription options
$subscription->optin = 'single'; // Or 'double'. Preset following the Newsletter settings, you can comment it out.
$subscription->send_emails = true; // Welcome or activaton emails, should be sent?
$subscription->spamcheck = true; // Perform spam check following the rules set on Newsletter Security page?

// Can return a WP_Error or true.
$result = NewsletterSubscription::instance()->subscribe2($subscription);
if (is_wp_error($result)) {
// You can deal with the error here, but this is a in-process function, do not break the
// flow with a die(). Do not output messages as well. Best practice is to manage the error
// from the caller, not here.
}

}
add_action( 'give_insert_payment', 'bdn_give_insert_payment', 10, 2 );

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