SilverMetal the "request" feature can be used in a number of ways!
When Quark becomes more widely acceptable for goods and services, etc...This is a nice way to invoice someone. You would fill out the requested amount, then choose the "share" icon to send the request..In that request, you could include details of the services you provided, or a quote for services to be rendered, or a product to be purchased, etc.

Also, another example.. Say your kid is at the cool movie theater down the street and they accept quarks! He requests x amount of QRK in a text to see the Matrix, part V...It starts in 30 seconds!! You get it to him just in time!!!