I am trying to build a Microsoft Windows based app using Lazarus and Free Pascal that connects to Intuit (QuickBooks Online (QBO) API server). In the past two months, I have successfully built a TIdHTTP component that “talks to” RingCentral using OAuth2, and I can issue API requests, in a production environment. So I know I can make OAuth2 work on a Lazarus/Microsoft Windows development platform.
I always start with PostMan, because it allows me to see the “mechanics” behind the scenes, then I emulate those URLs/URIs params, headers, etc. in Lazarus. But the thing I need most, no longer seems visible in PostMan. I just need to see the URL (or URI?) that PostMan sent to QBO. In my version, all I have is a “Get New Access Token” button, and it displays all the headers or parameters or what ever those things are, then I click “Get Token” , I am able to get a new token… but there is no way to see the URL that was issued to get this token.
I am using the QuickBooks Online V3API Collections OAuth2. These are all very helpfull, but only for the APIs after a token is obtained.