Abstract: Technologies for remote population and redaction of high security data are disclosed. A system in a low security zone that does not have access to high security data, such as credit card numbers, can provide instructions to a system in a high security zone for populating an outgoing message with high security data. The system in the high security zone can utilize the instructions to populate the outgoing message with the high security information and provide the outgoing message to an external endpoint, such as a third-party payment processor. The system in the high security zone can also redact high security data contained within an incoming message received from the endpoint before the incoming message is provided to the system in the low security zone.