Is there a machine-readable spec for the API?

Every WACO endpoint is published as OpenAPI 3.1, open without a key:

https://waco.id/openapi.json

Using it

• Postman — Import → Link → paste the URL above. Every endpoint appears with example payloads.
• Insomnia — Create → Import From → URL.
• Generate an SDK — use openapi-generator or similar to build a client in your language:

  openapi-generator-cli generate \
    -i https://waco.id/openapi.json \
    -g typescript-fetch -o ./waco-sdk

What it covers

• Endpoints for sending templates, free-form replies, media, media download and listing templates.
• Every error code and what it means (401, 403, 400, 404, 429, 502).
• The webhook schemas message.received, message.status and message.echo under webhooks — so you can generate types for the payloads we send instead of guessing from examples.

Want prose rather than a specification? Start with the API guide and the webhook guide.