How can I add a fixed amount to the total checkout in app customization?

[Jaap3]

I am making an App similar to Carbon checkout  . My query is  how to add fixed amount for example if a person checkbox a particular amount  say $1  ..how to  add  that amount to total checkout amount  . Thanks in advance 

[EasifyApps-Zoe]

Hi @Jaap3,

I recommend using the Easify Product Options app to create a checkbox with the additional price you desire. This checkbox can be seamlessly integrated into your product page. When customers select this checkbox, the total price will automatically reflect the addition of the checkbox price. This way, customers can proceed to checkout with the updated total price effortlessly.