PayPal is known to restrict usage to some countries. Sometimes you might need to use a different type of credit card. For instance, American Express card payments can only be made via PayPal by some countries.
If PayPal is not an option, please try signing up by selecting 'Pay with Credit Card' at checkout. These credit card payments are processed by Stripe and should not have the same restrictions as PayPal.
If you are still having trouble, please email us here.