Platforms Overview

Postsiva’s unified API and MCP cover eight publishing networks. Snapchat connects via unified OAuth. WhatsApp is an agent channel.

Unified publishing platforms

Platform	Connect	Text	Image	Carousel	Video	Notes
LinkedIn	OAuth	✓	✓	✓	✓	Personal profile + organization pages
Facebook	OAuth	✓	✓	✓	✓	Facebook Pages only (not personal profiles)
Instagram	OAuth	—	✓	✓	✓	Business/Creator account required
TikTok	OAuth (Business)	—	✓	✓	✓	TikTok Business account
YouTube	OAuth	—	—	—	✓	Video uploads with title + description
Threads	OAuth	✓	✓	✓	✓	500-character text limit
Pinterest	OAuth	—	✓	✓	✓	Requires `board_id` for every pin
Bluesky	Handle + app password	✓	✓	✓	✓	300-character text limit

Other platforms

Platform	Role	Docs
Snapchat	Unified OAuth + profiles	Connect via `/unified/oauth`
WhatsApp	Workspace agent (Pro)	Chat channel, not a publish target

Unified post/OAuth slugs (lowercase): linkedin, facebook, instagram, tiktok, youtube, threads, pinterest, bluesky, plus OAuth snapchat.

Connect accounts

OAuth platforms (all except Bluesky):

curl -X POST "https://backend.postsiva.com/unified/oauth/url" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: psk_live_YOUR_KEY" \
  -d '{"platform": ["linkedin", "instagram", "facebook"]}'

Open each returned auth_url to complete OAuth. Check status:

curl "https://backend.postsiva.com/unified/oauth/token" \
  -H "X-API-Key: psk_live_YOUR_KEY"

Bluesky uses handle + app password instead of OAuth — see Bluesky.

Post to multiple platforms

curl -X POST "https://backend.postsiva.com/unified/post/text" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: psk_live_YOUR_KEY" \
  -d '{
    "platforms": ["linkedin", "threads", "bluesky"],
    "default_text": "One caption, three platforms."
  }'

Each platform in platforms gets its own result object. Failures on one platform do not block others.

Platform-specific fields

Some platforms require extra fields beyond default_text:

Platform	Required / common fields
LinkedIn	`linkedin.linkedin_page_ids`, `post_to_personal`
Facebook	`facebook.facebook_page_ids`
Pinterest	`pinterest.board_id`
YouTube	`youtube.youtube_title`, `youtube.youtube_description`
TikTok	`tiktok.privacy_level` (optional, defaults to public)

See each platform page for full field reference and examples.

API key scopes

When using a scoped API key, only platforms listed in the key’s scope can be connected or posted to. A linkedin_only key cannot connect Instagram. See Authentication — API key scopes.

Character limits

Per-platform text and caption limits.

Media guidelines

Image and video requirements.

Scheduling

Schedule posts with scheduled_time.

Drafts

Save drafts and publish later.

Get started

Features

REST API

MCP

Platforms

Guides

Integrations

Errors

Reference

Platforms Overview

Unified publishing platforms

Other platforms

Connect accounts

Post to multiple platforms

Platform-specific fields

API key scopes

Character limits

Media guidelines

Scheduling

Drafts

​Unified publishing platforms

​Other platforms

​Connect accounts

​Post to multiple platforms

​Platform-specific fields

​API key scopes

​Related guides

Character limits

Media guidelines

Scheduling

Drafts

Unified publishing platforms

Other platforms

Connect accounts

Post to multiple platforms

Platform-specific fields

API key scopes

Related guides