A method and a system are provided for processing payment card transactions in conjunction with a user device configured to detect intoxicated use. The user device includes a behavior detection application which can detect whether a user is intoxicated using the device's motion sensing hardware, user endpoint data, and application level data. When the user attempts a transaction while intoxicated, the user's device can detect that the user is impaired or sober. If impaired, the payment card system can deny the transaction. If sober, the payment card system can offer incentives for certain transactions. The payment card system can also allow sponsoring entities to pay for transactions that incentivize better behavior when a user is intoxicated or support transactions for sober users.
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