[NSFW] Endless confirmation time

Hello, I am new to Amelia Booking and I have followed all the steps suggested in the videos of the official plugin page, I have already activated the Google Calendar API (it gave me a test API) and I have the test user active as well. The configured services and everything else, the plugin seems to work fine, but when I try to confirm the reservation it keeps loading and never progresses. Could you please help me?

The page I need help with: [log in to see the link]