Systems and methods are directed to improvements for secure communications between client systems and a vehicle integration platform associated with a service provider entity. In one example, a communication infrastructure is provided which includes a vehicle integration platform that includes a plurality of application programming interfaces configured to facilitate communication among clients. The communication infrastructure includes a security integration system which is configured to receive and validate a client certificate forwarded to the vehicle integration platform from a client and determine an identity of the client and an origin of a request associated with the client certificate. The security integration system is configured to generate a certificate signing request associated with the client certificate based in part on the identity of the client and obtain an operational certificate for the client based in part on the certificate signing request to establish ability for client authentication within the vehicle integration platform.