MemberPress: Generate All Invoices

function generate_bulk_invoices() {

  if( isset( $_REQUEST[ 'generate-invoices' ] ) ) {

    global $wpdb;

    $query = "SELECT id FROM {$wpdb->prefix}mepr_transactions WHERE status in ('complete', 'confirmed', 'refunded')";

    $txn_ids = $wpdb->get_results( $query );

    foreach( $txn_ids as $txn_id ) {

      $invoices = new MePdfInvoicesCtrl();

      $txn = new MeprTransaction( $txn_id->id );

      if ( $txn->id > 0 ) {

        $path = $invoices->create_receipt_pdf( $txn );

	  }

    }

    echo( '<p>Invoices generated.</p>' );

    die();

  }

}

add_action( 'admin_init', 'generate_bulk_invoices' );