If you created your Sling TV account using Amazon Pay, you can updated your payment information through Amazon. This can be done at pay.amazon.com.
, and sign in using your Amazon account credentials. Locate the Sling TV L.L.C merchant agreement, and select Details.
Under Payment Method,
Add a new payment method, or select an existing payment method. Make sure to include your billing address.
Finally, once you've entered the payment method details - including the billing address - select Use this payment method.
If you experience any issues updating your payment information, please visit pay.amazon.com/us/help
for additional assistance.