The common errors page lists a "rateLimited": "The request exceeds a rate limit". What limits are there? Searching for "rate limit" only returns that page.
The rate limits are:
20 certs / 7 days for base domains
5 requests / 7 days for Duplicate Certificates
This is the official community of Buypass. A Root CA located in Norway.
Sign-up using free email domains have been blocked due to increased spam. https://community.forumbee.com/t/63zsyt/blocked-email-domains