generated: '2026-07-21'
method: searched
source: https://docs.liftoff.io/advertiser/direct/liftoff-s2s-integration
spec_type: Webhooks
note: >-
Vungle/Liftoff exposes a server-to-server (S2S) postback integration rather than a
published AsyncAPI document. Advertisers/MMPs send postbacks to Liftoff to augment
standard MMP attribution with additional optimization signals. This captures that
event/postback surface as a webhook catalog. No AsyncAPI spec is published.
webhooks:
- name: mmp-postback
direction: inbound-to-liftoff
description: >-
Server-to-server postback sent from the advertiser/MMP to Liftoff on install and
upper-funnel engagements, matched to Liftoff clicks/impressions for optimization.
matching_identifiers:
- third_party_tracking_token
- mmp_tracker_device_id
- gaid
- idfa
docs: https://docs.liftoff.io/advertiser/direct/liftoff-s2s-integration
- name: self-attribution-postback
direction: inbound-to-liftoff
description: Self-attribution postback flow for advertisers not using a third-party MMP.
docs: https://docs.liftoff.io/advertiser/direct/self_attribution
sources:
- https://docs.liftoff.io/advertiser/direct/liftoff-s2s-integration
- https://docs.liftoff.io/advertiser/direct/self_attribution