How to Properly Test a Salesforce API Connection Beyond Just Authentication

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A successful Salesforce login only confirms authentication, but a fully functional API connection requires reaching the correct org, using a valid instance URL, and accessing the necessary objects. Developers should use OAuth tokens returned after authentication to identify the correct instance URL, avoiding errors caused by hardcoded endpoints from other sandboxes or production environments. Salesforce recommends starting with a read-only request, such as the GET Limits endpoint, before attempting any create, update, or delete operations. Testing access to specific objects like Accounts or Contacts is also essential, as authentication alone does not verify that an integration can reach the required resources. Following this structured sequence — authenticate, test basic connectivity, verify object access, then add write operations — makes it easier to isolate failures before broader integration testing begins.

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