Abstract: Methods, systems, and computer program products for securely exchanging a credit card token with an external computer for purchasing a product. The system includes one or more processors, a memory, and a camera coupled to at least one processor. The system scans a first barcode by the camera. The first barcode is published upon a display of the external computer and indicates a plurality of payment parameters of the product. The system decodes the first barcode to extract the payment parameters. The system publishes the payment parameters for display to a user. The system receives a first input, where the first input indicates a credit card number for purchasing the product, and a credit card token that corresponds to the credit card number is saved in the memory.

Abstract: Methods, systems, and computer program products for payment terminal sharing. A payment terminal is configured to become usable as a payment terminal shared by a plurality of operators with cryptographic segregation between the different operators of the payment terminal. An operator- and terminal-specific transport key is provided to the payment terminal. An operator- and terminal-specific initial-encryption key is derived, by the payment provider, from an operator-specific base-derivation key using the terminal-identification number, or an additional identification number of the payment terminal. The operator- and terminal-specific initial-encryption key is transmitted to the payment terminal, and is decrypted at the payment terminal.

Abstract: Methods, systems, and computer program products for payment terminal sharing. A payment terminal is configured to become usable as a payment terminal shared by a plurality of operators with cryptographic segregation between the different operators of the payment terminal. An operator- and terminal-specific transport key is provided to the payment terminal. An operator- and terminal-specific initial-encryption key is derived, by the payment provider, from an operator-specific base-derivation key using the terminal-identification number, or an additional identification number of the payment terminal. The operator- and terminal-specific initial-encryption key is transmitted to the payment terminal, and is decrypted at the payment terminal.