Examples presented herein describe secure point of sale (POS) operations. One example is a method including receiving, at a mobile device, a communication associated with a custom tender payment for a secure transaction payment, where the mobile device includes a custom payment application configured for the secure transaction payment with a point of sale (POS) device. The method includes receiving account data associated with a user account selection for the custom tender payment for the secure transaction payment, transmitting an account signal including the account data, where when the account signal is transmitted to an integration server as part of the secure transaction payment, the account signal is not transmitted to the POS device, and receiving an authorization communication, where when the authorization communication is received by the mobile device from the integration server, the authorization communication is not communicated to the mobile device via the POS device.