How can I receive adhoc payments on Shopify?

Just migrated to shopify payments from PayPal

I sell a basic B2B service and negotiate add ons based on the customers budget and requirements

I cant find a way to receive adhoc payments - i could give someone my paypal address and receive payment

An item has to a shop listing or a shopify invoice?

This is a real issue if its the case

Hi

You could create draft orders and the customer then receives the invoice with terms to pay so they checkout through Shopify.

https://help.shopify.com/en/manual/orders/create-orders

Regards

Sam