Hi,
Thanks for the interest in Eventbrite Tickets.
You do not have to purchase Pro to use EventBrite, you can just purchase that plugin.
However, due to Eventbrite’s API on the site we can only accept PayPal payments and not debit/credit cards.
If you are looking to sell tickets with a debit/credit card you could look at one of our ticketing add ons ( also can be purchased without Pro)
However, the debit/credit card payment is handled by the eCommerce plugin (WooCOmmerce, EDD, etc) so you may have to purchase a plugin to do that from them and setup an ssl.
Let me know if you have any follow up questions.
Thanks