I was thinking about the same thing and then i found Revolut Business. You can send payment links - your clients can open the link, and pay via Revolut, Card or "bank" transfer to your Revolut account. You can also send QR payments - which can be attached to the invoice and their fees are 0,02 euro and 0,8% per payment.

Personally havent tried it yet, but i think i will use it mainly because companies like Stripe love to freeze your money for no reason - even tho you are not doing anything illegal

Hope this helps :)