We’ve have successes in Apps10 with Basic Authentication. The API needs the compatibility mode enabled (in API Explorer) to access it via an INT URL with your integration engine. You can then use an existing IFS user to connect to the API, if that user has access to the projection (i.e. can use it).. You might need to whitelist the IP of the integration engine. 

Once the Basic Authentication goes through, you’ll receive two cookies to use for subsequent calls. 

Try with POSTMAN 1st. If Postman works .. everything else will too. 

Hi @SMANUEL 

IFS APIs access through {{IFS_URL}}/main/ifsapplications/projection/… endpoint should be authenticated with OAuth2.

Same API can be accessed with basic authentication by enabling the compatibility mode as @DHCRADPA mentioned using  {{IFS_URL}}/int/ifsapplications/projection/…  endpoint

If you planning to upgrade to IFS Cloud recently, it’s recommend to use the OAuth2 since basic authentication is not available in IFS Cloud.

Read more on how to use OAuth2 in IFS 10 depending on your use case in below blog post.

https://dsj23.me/2021/01/08/ifs-authentication-flow-with-oauth-and-openid-connect/

Hope it helps!

Damith

Offtopic (Damith.. I really like your blog! Reading it since you posted the Oauth flows)

@DHCRADPA@dsj Many thanks for your inputs...Appreciate..