I have written website shopping cart software using MySQL and PHP and I need to add a way for users to pay with Bitcoin. This seems like a basic need for developers in general, but I'm having difficulty nailing down exactly how this works. Apologies in advance if this is a duplicated question!

The shopping cart shows the total amount due and when the user chooses to pay with Bitcoin, I imagine it should work like this:

shopping cart software generates a new payment (raw transaction?) address where the user should send their bitcoin payment.

Something (?) monitors the blockchain for the payment to this new address and updates the local database / user web interface to acknowledge when the payment is received.

I would appreciate any information clarifying the above processes!

A lot of searches about this including here on StackExchange are returning plugins for wordpress or joomla or such, but I don't want to use one of those overloaded CMS packages. Perhaps there's an existing API I would leverage but ideally I'd like to code as much of it myself as possible to limit the "unknowns" in the workings of this cart. tyvmia