You really should have a look at IMan by Realisable.  It's an integration  tool that is already aware of Sage 300.  It hides you from the API so you don't have to try and go through a (steep) learning curve.  Also takes away most of the general integration development headaches.  I would ALWAYS look at IMan first for an integration project. 

https://realisable.co.uk

Stephen,

We consider an opportunity to create the connector ourselves.
I would be extremely grateful if you could share links to the API specifications that help us to customize the integration process with Sage 300 SDK.

Thank you,
Andrew

Stephen,

We consider an opportunity to create the connector ourselves.
I would be extremely grateful if you could share links to the API specifications that help us to customize the integration process with Sage 300 SDK.

Thank you,
Andrew

cdn.na.sage.com/.../Sage300_WebAPI_EndpointReference.pdf

Thank you!

Do you have a link to how to create an authorization request?
Also, this document includes endpoints. Does Sage 300 have a link to API with examples of requests, responses?

That's all there is.  Google might help.

Jay,

I need your help.
We established the Sage 300 SDK, but I cannot found of how I should install web screens to customize API calls.
Could you provide an example of how to do it?

No, sorry, I've never customized any of the new web screens.  None of my clients have asked for it.

Jay, could you help with the following issue?

I opened my Sage 300 desktop, but I cannot use the Notes button. The Button is unavailable. It is the KN module and I cannot see it in the Activation list.
How I can activate the Notes module?

If you can see it in Help/System Information, then login as ADMIN and set up a security group.  If you can't see it, then run the System Manager setup and select it.

Jay,

I cannot find how to do it.
Could you please provide an example with screens?

sageu.csod.com/.../Welcome.aspx