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Michelle ArndtMichelle Arndt 

We are not getting lead notifications for a certain source from an API. How do I fix this?

I found this information but I'm not sure how to go about doing it:
When a Lead or Case is created via the API, the API call would need to include:

* "AssignmentRuleHeader" to trigger the Assignment Rules.

* "EmailHeader" with "triggerUserEmail" set to 'true' to generate assignment notification emails.


If AssignmentRuleHeader is specified, and EmailHeader is not specified, then the records will be assigned but no assignment notifications will be sent to the assigned record owners.
 
Andy BoettcherAndy Boettcher
The system that is passing you leads must set these headers in order for the functionality to work - https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_header_assignmentruleheader.htm