This is basically how services like Uber Eats work in my country. The basics of it are foreign students want to earn extra income by working a few hours per week. This is allowed on a student visa, but it's limited hours, so real businesses like restaurants or bars don't usually want to hire students.

First of all you need a means of transport. There are small companies that will rent to you - on a weekly basis - an electric bike or a 20 year old Toyota Prius that is barely legal to drive (we have strict technical inspections here, so it's not that bad). They handle all the maintenance and insurance, you just pay your money and get a vehicle.

Next up you probably can't use your drivers license from home here to drive, as once you have a residence visa you need a local license. Many people just risk it, but if you want to do it legally you need to have a minimum number of lessons with an instructor and then pass the test. The test is only in the local language, so if you don't speak it (zero chance as a student that's been here 3 months), you need to hire a translator to accompany you on your test. They may or may not help to ensure your answers are correct. (You can only exchange a driver's license from other EU countries)

Finally you need a worker account on the delivery service, and the bag. You can register as self employed, file all the documents, go through the training course. That will take time, plus I think they are not always looking for new people due to high demand from workers. So you can skip all that and just rent an account from someone else, and hope they pay you at the end of the day.

So there is an entire industry dedicated to helping people earn a side income. I'm surprised the delivery services themselves don't start getting involved in this as it is a lot of money they are leaving on the table - although most of it has a questionable legal status.