Hi @Nevv
In your other question I have provided some information on how to get help in having access to your child.
If you refuse to pay child support, the mother can apply for the child support advance payment (Unterhaltsvorschuss) at her local Jugendamt. The Jugendamt will then grant her this monthly benefit and contact you to request that you repay it to them. If you are not working or only have a low income, then you provide this information to them. You will then not have to pay for now but in the future if you earn more you will likely be asked to repay the payments.
If you are able to pay but refuse to do so, or do not engage at all with the Jugendamt, it will be brought to the family court. There the judge can make a ruling on Unterhalts payments and order you to pay. If you then continue to refuse to pay, there are proceedings whereby your assets (e.g. money in your bank account) or income (e.g. your work salary) can be seized.
A family advisory service will be better able to advise you on this.
Best,
Éanna