If you can't validate the purchase code or Token, please ensure the following:
1. The cURL PHP extension is functioning properly
2. Your server must use one of the supported platforms listed here: https://letsencrypt.org/docs/certificate-compatibility/#platforms-that-trust-isrg-root-x1
3. If you use OpenSSL, please update it to version 1.1.0 or newer. Version 1.1.0 was released in 2016 and is the oldest version that supports the new LetsEncrypt certificate chain. However, we would strongly advise you to only use the most recent OpenSSL version (3.3.2 as of September 2024).
5. Elements Token are generated for and work only with a particular URL. If, for example, you migrate your website from http:// to https://, you will need to regenerate the token.
6. If there is anything which prevents the connection between the customer's website and https://updates.vamtam.com, you will also see a validation error. In this case you should contact your hosting provider,