If you wish to limit the number of products your customer can purchase from you to 1 then you will want to pass in the additional parameter called ‘fixed’ with a value of ‘Y’. This parameter will only allow 1 product to be added to the cart. It will lock the quantity field and remove the continue shopping button as well.

The PayPal payment method is offered to your customers on both the order review page and the payment method page in the purchase routine. Please note that PayPal is not offered on recurring products and will not display as an option when placing demo orders.

If you want to prevent customers from changing quantities after the sale information has been sent to 2Checkout you can use the ‘fixed’ parameter. In a form, it will look like this:

In a URL it’ll look like this:

https://www.2checkout.com/2co/buyer/purchase?quantity=1&product_id=10&sid=11&fixed=Y

Once a cart is placed in fixed mode it will not accept quantity changes or additional products until the end of the sale.