How can I sell things online legally as an under-aged person?

Question

I'm a pupil from Germany, I'm 15 years old and I want to sell a product online.

However, it's not as easy as it may sound. The first problem is that I am not allowed to sell things before I'm "unbeschränkt geschäftsfähig" (legally competent), and this is normally the case when I reach the age of 18. Fortunately, there is a law that can make me "unbeschränkt geschäftsfähig" before if my parents allow this.

The real problem is that I cannot find any online payment system that allows me to use it because I'm underaged. I would like to sell under my own name, so asking my parents for doing this for me is not a really good option in my opinion.

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Here are some of the payment systems I found:

(You don't have to read through all this stuff.)

Paypal

They would be great. Unfortunately, they want me to be full-aged ("volljährig"):

GiroPay

GiroPay seems like a good choice. It looks very complicated and seems to want me to be full-aged, though (at least they offer a service to "let my clients approve that they are full-aged"). On the other hand, I couldn't find the requirement "full-aged" in their AGB. They are probably too expensive for me because they want a €99 fee once and €9.90 for every month after that if I want to use their payment service provider. Again, this stuff makes it pretty complicated honestly.

Google Wallet

I won't use this. Firstly, they offer only support for credit cards (which most German people don't have). And again, they want me to be full-aged:

(marked things: if I'm between 13 and 17 I'm allowed to use Google Wallet for Google Play Store only, if I'm at least 18 I'm allowed to use it for other purposes, too)

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Question: How can I legally sell things / services on the internet as an under-aged person (when I'm allowed to sell things generally)?

Answer 1

Using the bitcoin network has no age restrictions.

From my experience the merchant services for using the network natively are severely lacking, and payment processors that accept bitcoin, such as Stripe, Paypal, and Bitpay have much better merchant services, but then you still face the dilemma of using a payment processor.

Also from my experience, people like to pay with credit so they pay later, while bitcoin is a debit network.

The barrier of entry is extremely low, and also newer e-commerce sites that only accept bitcoin like OpenBazaar would probably appreciate your dilemma. Although people you know might not be familiar with bitcoin payments, other people interested in your product may be.