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Social APIs often bury network-specific knobs in a platformSpecificData bag. WhatsApp is one platform, so LazyApp puts the options on the message itself.

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Choose which number sends

Workspaces can have more than one connected number. Omit both fields to use the default.
Or address the LazyApp connection:
API keys can be restricted to specific numbers; using a disallowed id returns 403.

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Reply in a thread

Quoting works with every message type except reactions. WhatsApp leaves the quote off when the original was deleted or is older than about 30 days, and on templates. WhatsApp can show a preview card for the first https:// or http:// link in a text message. Ask for it with preview_url:
The preview comes from the page’s Open Graph tags (og:title, og:description, og:url, and an og:image under 600 KB, at least 300 px wide). They must sit in the <head> within the first 300 KB of the HTML. Without preview_url, or when WhatsApp cannot fetch a preview, the link is still tappable. The inbox turns previews on automatically when a reply has a link, with a switch to turn it off.

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Time-to-live on schedules

With send_at, set ttl_seconds so a late reminder is dropped instead of arriving hours late. See scheduling. Direct Send (utility / authentication without a pre-approved template) also takes ttl_seconds with Meta’s category-specific bounds — see the Direct Send endpoint.

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Metadata

Up to 20 string values. Echoed on webhooks for reconciliation:

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Interactive shapes

Buttons, lists, link buttons, location requests, media carousels, India address forms, flows and catalog / product messages all use type: interactive with an interactive object. The contact’s choice arrives as message.received. Every type, its limits and examples: Interactive messages.

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Identity check

With the identity check on, LazyApp sends the contact’s stored identity hash with every message. Pass recipient_identity_key_hash to use your own. See Identity, privacy and data.

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What is not here

There is no Twitter-thread, Instagram-Story, or TikTok-privacy bag. LazyApp is WhatsApp-only. For number health and feature gates, use GET /v1/capabilities.