[keycloak-user] Propagate updated password to external systems

Hello, Firstly, I’m sorry if this email is a duplicate of another thread; I didn’t find it. In case, point me to that thread please. I have this scenario (with Keycloak 3.4.3): An user changes its password The password must be propagated in clear text to 2 external systems (they are reachable by a REST interface) How do I do it? I thought to develop a provider, but I don’t know which SPI to use. Thank you very much. Regards, Alessio G. B.