mepr-completed-recurring-transaction.php

<?php

function mepr_completed_recurring_transaction( $event ) {
	$transaction = $event->get_data();

	if ( $transaction->subscription_id > 0 && $transaction->product_id == 76026 ) {
		// Subscription id is greater than zero, so it's a recurring subscription.
		// Make sure the transaction's product ID is 76026.
		$sub = $transaction->subscription();
		
		// Get the transaction count with $sub->txn_count
	} elseif ( $transaction->subscription_id > 0 ) {
		// Still a recurring payment, but it's not related to the membership with ID 76026.
		$sub = $transaction->subscription();
	} else {
		// One-time payment.
	}
}
add_action( 'mepr-event-transaction-completed', 'mepr_completed_recurring_transaction' );