Hii @adunsulag Actually I’m implementing smartfhir app in openemr so when we launch the app, Application open a Iframe then authentication happen once authorize then it redirect with auth code on redirect url then using that code we hit token endpoint. Betwwn this duration Iframe show in blank screen, I want to show loader once user launch till get token, How to implement it. Is it provide openemr of we have to in our fhir app.