You can use either one of Stripe or PayPal to take payments from your attendees. Both platforms will charge you a per-transaction fee for this service, which can change over time and depending on your sales volume and territory.
You can find out the current prices for Stripe and PayPal services for your location and currency below:
If your country is not listed above, please visit:
https://stripe.com/pricing
or
https://www.paypal.com/webapps/mpp/paypal-fees