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Need solution for Web Shop (no credit card needed)

Hi Guys
my client wants a very basic web-shop, he doesn’t want to pay an extra fee for e-commerce.
He doesn’t need a credit card terminal as he will send the product with an invoice (in Switzerland this is possible). The only thing i need to create is a shopping card where the selected items will go and an automated e-mail that will notify the items sold.

Any idea where to start and if that is even possible?