payment_cart_products_inbundle_fieldname payment cart products inbundle fieldname Items in bundle field name In the products tracker, the name of the field for a comma-separated list of product IDs of products in the bundle (that is, if the field contains anything, then this product is a bundle). You can also specify the number of the sub-products; for example, 23:(“colon”)2,24 means item 23 (x2) + item 24 (x1) 