Buy Now Button On Custom Section

[shoma1]

Hi there. 

I have created Ajax Cart, and I want to use "Google pay" button on Ajax Cart.  

Ajax Cart is the section which appears on each page of the store, like Header, Footer.

I know that I need {% form %}. Im using 'product' form type, and the product I get from admin(section block type 'product'). The Button appears but it is not clickable and it doesn't work.

I have the same button on Product Page and it works fine. 

Is it possible to use this button or "Buy it now" on custom sections or pages? 

Thanks in Advance.