What payment processor do I use ?

[Zwielicht]

I have a few suggestions for you based on my own personal experience.

For example, I've used Wise to accept large international payments. I quite liked it because the funds were deposited in my back account the same day.

PayPal is expensive, but easy to use. I have PayPal integrated with OfficeOutlaw, but the high fees are annoying.

Stripe is another option, but I don't have much experience using it.