12 sounds fine. I won't object to lower but 3-6 % is what most other modern digital platforms charge. Adding your own 3-6% on top a payment processor as a platform hostong content sounds reasonable.
Why are payment processor fees 3-6%? The court should investigate that too, it can't cost more than a few cents to process that charge.
Why are payment processor fees 3-6%? The court should investigate that too, it can't cost more than a few cents to process that charge.