My payments are rejected by payment processor

Most of the time, if the payment processor rejects a payment it's due to a VPN. It sees the difference between your usual/official location and your current one and assumes you're trying to scam it. Simply make sure to turn off proxy/VPN/other ip-masking software and it should be good.
Payments can also be blocked for security reasons directly by the bank that issued your card. If this is your first purchase in our store the bank assumes a possibility that your card might have been stolen and used by someone else without your authorization. In this case you need to contact your bank support to verify the transaction.