Can I fetch Linkedin inbox direct messages to my project. And also can i send messages, get messages to linkedin through my project

LinkedIn provides several APIs for messaging-related scenarios, but access is limited to specific products and use cases. Direct, general-purpose access to a personal LinkedIn inbox from a custom project is not described in the provided documentation.

From the available context, these are the supported, documented options:

1. Communications (Invitations and Messages) APIs
   LinkedIn exposes:
   • Invitation API – to send invitations to connect.
   • Messages API – to send messages to existing connections. These are described as allowing applications to use LinkedIn’s Inbox to send invitations and messages, effectively making an application a “social communications hub.”
     Details and requirements (permissions, partner programs, rate limits, etc.) are not in the provided text, but the high-level capability is: send messages to existing connections and send invitations via API.
2. Marketing Message Ads / Sponsored Messages
   For advertising scenarios (not normal inbox DMs), LinkedIn supports:
   • Message Ads API – to set up and manage Message Ads that are delivered as sponsored messages into members’ InMail inboxes under an ad account.
   • Message Ads are branded, paid messages with a call-to-action, optionally with Lead Gen forms, and are part of LinkedIn Marketing APIs.
   • Message Ads are being discontinued starting May 2023, and the documentation recommends using Conversation Ads instead.
     This is for paid campaigns, not arbitrary inbox access.
3. Recruiter / Talent-specific InMail APIs
   For LinkedIn Recruiter and CRM integrations (not general LinkedIn accounts), there are:
   • InMail History APIs (Recruiter System Connect and CRM Connect) – to retrieve InMail activity (sent and received) for a given LinkedIn Recruiter contract. These are intended for ATS/CRM integrations and require:
     • A LinkedIn Recruiter contract.
     • Seat URNs for Recruiter seatholders.
     • Member URNs for prospects.
     • Authorized access via the documented authentication flows.
   • These APIs are designed to periodically pull InMail history (e.g., every 30 minutes, with a maximum 12‑hour time range per call) and support pagination.
   • There is also a stub profile mechanism to create/update candidate records in an ATS based on InMail responses. These APIs are not generic inbox access; they are scoped to Recruiter contracts and candidate communication.
4. Dynamics 365 Sales + LinkedIn InMail
   Dynamics 365 Sales integrates with LinkedIn to:
   • Use a Send InMail activity from within Dynamics to message customers who are not already connections.
   • This is a productized integration; the InMail pane opens inside Dynamics and sends the message via LinkedIn.
     This is not a generic API for arbitrary projects; it’s a built-in feature of Dynamics 365 Sales.

Summary for a custom ASP.NET/API project:

• The context confirms that LinkedIn has APIs to send messages (Messages API, Invitation API) and to send sponsored Message Ads and retrieve InMail history for Recruiter/CRM scenarios.
• Generic, full access to a user’s LinkedIn inbox (fetch all direct messages, send arbitrary DMs to any user) from a custom project is not described here.
• To send or retrieve messages programmatically, the project must fit into one of the supported scenarios:
  • Use Communications APIs (Invitations/Messages) for messaging with existing connections, subject to LinkedIn’s access and permissions.
  • Use Marketing Message Ads / Conversation Ads for sponsored messaging campaigns under an ad account.
  • Use Recruiter InMail History APIs only if integrating with LinkedIn Recruiter/CRM and holding the appropriate contract and authorization.

For implementation, review the specific API documentation linked under:

• Invitation API
• Messages API
• Message Ads API
• Retrieve InMail History / InMail Stub Profiles and ensure the project meets the prerequisites (ad account, Recruiter contract, sender permissions, authentication, etc.).

References:

• Communication APIs
• Message Ads API
• Message Ads
• Retrieve InMail History
• Retrieve InMail History - CRM Connect
• Module 3 - Retrieve Data from LinkedIn
• Work with LinkedIn activities
• Archived Marketing API Changes 2022