Dear Employer,
The requirement itself is satisfying about what we need to achieve using the bot, though it stays unclear until what extend bot will be used. For complete purchase, payment gateways do have some security barriers to avoid bots.
I'm happy to lend you my consultancy at no cost, please feel free to contact me.
We can choose from selenium or cypress. I'd prefer cypress coz all these websites are built using JS, and of course performance reasons too.
If you decide to proceed with the project with me, we can negotiate over the cost and delivery timeline once we lay the work-to-be done in detail.