Convert HTML to PDF from FlowMattic

Wire it up

The shared request is Authorization: Bearer wc_your_key and {"url": "https://example.com/"}. FlowMattic changes the wrapper, not those values or the authenticated download.

1. In a workflow, add the API Request action (the Webhook/API family's outgoing HTTP call).
2. Set Request URL to your serving origin plus /v1/convert and Method to POST.
3. Add Headers: Authorization with value Authorization: Bearer wc_your_key, and Content-Type with value application/json.
4. Set the Request Body to {"url": "https://example.com/"}, with a workflow variable in place of the example's url where the trigger supplies one.
5. Add a second API Request task: Method GET, the receipt's download value as the URL, and the same Authorization header. The download endpoint is key-scoped: without the header it answers 401, and another key's id answers 404.

The full request

Action:       API Request
Request URL:  https://webcapture.io/v1/convert
Method:       POST
Headers:      Authorization = Bearer wc_your_key
              Content-Type = application/json
Request Body: {"url": "https://example.com/"}

The action's response is the receipt JSON, so download maps into the second API Request task, whose GET carries the same Authorization header and returns the bytes. The download endpoint is key-scoped, so a webhook or email that carries only the url hands over a 401: the key has to travel with the fetch.

Limits

The convert endpoint rate limits at 120 requests a minute per client IP, answering 429 with retryAfterSec when the window is full. The monthly quota is per account: exhausted, the answer is 429 with used, limit, resetDate, and upgradeUrl, and every receipt's remaining field shows the count after that render. A trigger page that renders slowly fits better as ?wait=false: the 202 ticket's download url can ride a later task.

Related

• FlowMattic documentation: the integration surface this page checked against.
• The webcapture API reference: every field the convert endpoint admits, with the response shapes.
• The free URL to PDF tool: try the same render in a browser before you wire the step.
• The automations hub: the same call translated for the other platforms.

Method

Checked 2026-10-05 against FlowMattic: The API module's fields follow FlowMattic's support documentation for the API Request action at support.flowmattic.com; the action's exact label follows the current editor. Source: https://support.flowmattic.com. Corrections: hello@webcapture.io.

Get a free key or read the API reference to wire FlowMattic.