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How do you verify my card for Madlabs?

We use BrainTree a system powered by Paypal to verify your card.

Braintree describes the process as this, 

"The gateway verifies credit cards by running either a $0 or $1 authorization and then automatically voiding it. For most processors, Visa and Mastercard are initially tried with $0 authorizations. Because some card types (like Amex and Discover) don’t consistently support $0 authorizations, they are only tried with $1 requests."

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