Abstract: Methods and apparatus, including computer program products, for payment card terminals for mobile phones. In general, data characterizing a payment card and a settlement amount for a transaction may be received, where the data is user-generated input and is received at a mobile phone associated with a mobile phone number. Wireless transmission of data characterizing a request to provide a payment card settlement service of a merchant account of a merchant account provider for the transaction may be initiated, where the wireless transmission is to be from the mobile phone over a carrier data network to an application server. Data characterizing authorization of settlement of the transaction with the payment card may be wirelessly received by the mobile phone from the application server.

Abstract: Methods and apparatus, including computer program products, for gift card services. In general, data characterizing a request to provide a merchant credit service to an intended recipient is received and a message to be sent to the intended recipient is generated, where the message characterizes a phone number to call to activate the merchant credit service. Data characterizing authentication by a call to the phone number to activate the merchant credit service from the mobile phone number of the intended recipient is received, where the authentication includes checking caller identification of the call to ensure the call is from the mobile phone number of the intended recipient. The merchant credit service is activated. Credit associated with an account of a merchant credit service may be redeemed by providing an account number of the service. Redemption may be authorized based on caller identification of a mobile phone number associated with an account.