Post to Facebook from Zapier
Wire Zapier to one endpoint, then publish or schedule Facebook Page posts, reels and photos from any trigger you already run — with a signed webhook for every delivery.
How it connects
A Webhooks by Zapier action, so any Zap trigger becomes a scheduled post. There is nothing to install on the Zapier side and no per-network module to configure — Facebook is a channel id in the request body.
POST https://api.postwharf.com/v1/posts
Authorization: Bearer YOUR_WORKSPACE_KEY
Content-Type: application/json
{
"text": "Shipping today.",
"channels": ["ch_your_facebook_channel"]
}
A typical Facebook automation
The whole integration is a Webhooks action at the end of a Zap, with the fields mapped from the trigger. Trigger on a new row in a sheet, then queue the post rather than publishing it straight away:
{
"text": "New this week",
"channels": ["ch_your_facebook_channel"],
"publish_at": "2026-09-01T09:00:00Z"
}
Find the channel id once from GET /v1/channels — the one you want carries "platform": "facebook". Text longer than 63,206 characters is refused with a 422 in your hand, rather than accepted and rejected by Facebook minutes later.
What Facebook accepts
Pages only — the API cannot publish to personal profiles, whatever the account you signed in with.
Getting the result back
Register a webhook and every delivery outcome is posted to you — published, retrying, failed, or removed after publishing. Each is signed with HMAC-SHA256, so Zapier can verify it came from us before acting on it. That is the difference between a run that succeeded and a post that landed, and only the second one is worth a notification.
One thing worth setting up correctly
A Zap runs in a line, which makes it tempting to build one per network. Do not — every channel id goes in the same `channels` array, so five networks is one action, one Zap task, and one post carrying five receipts.
Questions
Can Zapier post to Facebook automatically?
Yes. Zapier calls one REST endpoint with a workspace key, so any trigger you already have can publish or schedule to a connected Facebook channel without a Facebook-specific module.
What do I need before Facebook will work?
Pages only — the API cannot publish to personal profiles, whatever the account you signed in with. Once the channel is connected in PostWharf, Zapier reaches it the same way it reaches every other network.
How long can a Facebook post be?
63,206 characters, counted on the post body. PostWharf checks that before the post is queued, so an over-length post is refused immediately rather than failing at Facebook after everything else in the same batch has already published.