What do I have to say?

Afterwards I will go to the Rewe at the main train station near my vocational school and I want to get a 25 Euro Paysafe card so I can buy minecraft

I'm 21 years old.

What do I have to say at the checkout?

Have never done that before.

Exactly what you want. It's not difficult.

Either there are cards on the shelf at the cash register, which you then simply put on tape or give to the seller directly, or you simply tell the seller that you want a 25 euro paysafecard.

They hang around on the sales stand in the checkout area. You don't have to say anything - take it away and pay is enough.

See if the store has put prepaid cards at the cash registers (Steam, PSN, etc). Paysafe could also be located there. Otherwise, simply tell the employee at the checkout that you would like to have another 25 euro paysafecard.

If you do not buy anything else (i.e. Have nothing on the belt) put an additional divider on the belt so that the saleswoman does not mistakenly collect the items from the next customer.

I would like a kilo of minced meat!