Exchanging XML messages between two systems via HTTPS POST requests
I don't know if its the correct place to ask this question but I have a project going on relating to single sign on using XML API POST requests.
We have a website which needs to have a single sign-on to log on to another website (online rewards).
"XML messages will be exchanged between your system and Online Rewards platforms via HTTPS POST requests. When an XML API message is generated and delivered to the Online Rewards platform by the client via an HTTPS POST, the message is validated for integrity and the specific API method for the message is executed"
I have the for the XML API message structure given by the online rewards people.
I am a rookie in this field but I would really appreciate if someone can help me in how to go about this project.