[keycloak-user] Account registration with proprietary Masterdata

Hi, I want to know the best practise to follow in Keycloak or any OAuth server to sync keycloak users with the proprietary system. We are having a proprietary system (called MDM) that handle all the user / person / organisation / employer / employee information in microservice environment. We moved to keycloak for authentication & authorization across all microservices. And all the endpoints are secured by keycloak. And we never bothered about user registration. Now we have enabled user registration on keycloak.And now figuring out what is the best way to sync keycloak users after registration with the existing MDM. All our microservices can understand the users in MDM and not the users in keycloak as if they need more info about user it can interact with MDM. My first thought would be sending REST request to MDM from keycloak with the newly registered user information. Please share your experience if you guys already done it in your system. Regards Ratna