Hi there @RavinderK 

You can call either synchronously (using RESTMessageV2 in server-side scripts) or asynchronously (using Scripted REST APIs, Outbound REST, or IntegrationHub).

For on-prem/cloud APIs, make sure to configure MID Server if the endpoint isn’t publicly accessible.

Handle authentication via Connection & Credential Aliases (OAuth2, Basic, API Keys).

Always add timeouts, retries, and error handling to avoid performance issues.

Use async (queued jobs/IntegrationHub) for long-running or heavy calls.

Best to use async calls whenever possible

External Content Ingestion API