Automate Greenhouse offer approval workflows

Steps

1. Configure job approval and offer approval flows in Greenhouse Recruiting under Configure > Approval; define the approver chain and map it to your HRIS roles if using an external approval system
2. Subscribe to the offer Greenhouse webhook events (offer_created, offer_updated, offer_approved, offer_rejected) in Configure > Dev Center > Web Hooks to receive real-time notifications when offer state changes
3. When an offer_created webhook fires, retrieve full offer details via GET /v1/applications/{applicationId}/offers/current_offer on the Harvest API using your API key in Basic Auth
4. If your HRIS or external approval system must sign off, push the offer details to the external system and wait for approval; when approved externally, update the offer in Greenhouse via PATCH /v1/applications/{applicationId}/offers/{offerId} with the approved fields
5. To trigger or advance the approvals process programmatically (e.g., after uploading a signed offer letter), use the offer update endpoint; uploading an offer_letter attachment to an existing offer will retrigger the Greenhouse approval chain
6. Assign approval permissions to approvers via PUT /v1/jobs/{jobId}/job_permissions with the appropriate approver user IDs and permission levels before the approval flow is triggered