Ask HN: Which donation platform are you using?

I'm making an open source forum, and I'm planning to add a feature.

People can be donated for their topics, (I think good content should be encouraged).

The function is: 1. People add the payment to their profile. 2. Show a donation button on the bottom of their topic, if he thinks they are worth.

I know maybe Paypal, Stripe can do this, if there any advice? Thanks