Synthesia accepts all major debit, credit and master cards as well as other payment methods. If your payment is unsuccessful or appears to have failed, check the following:
Card details entered match and have the correct billing address.
Card expiry date.
Sufficient funds are available.
If you are experiencing more issues regarding payments, including double charges or issues with changing a payment method, contact Synthesia support team by live chat or via email immediately.
To learn more about Synthesia billing, see the Billing & Usage documentation. Also see the Synthesia's Terms of Service.