Authorization header. Create an API key in Settings, then send it on every request.
Get an API key
API keys belong to an organization. Create one in the Formable app, then copy the key when it’s shown. For detailed steps, see Set up a developer account.1
Create an organization
Go to Settings and create an organization if you don’t have one yet. You need an organization before you can generate keys or register webhooks.
2
Generate a key
In the API keys section, click Generate key, give it a name, and confirm.
3
Copy the key
Copy the full key immediately and store it as an environment secret. Formable shows it once — after you close the dialog, only a short prefix (for example
fmbl_a1b2c3d4...) remains visible.Use the key
Include the key in theAuthorization header of every API request.
fmbl_. Treat them like passwords: store them in a secrets manager, rotate by creating a new key and deleting the old one, and never commit them to source control.
Base URL
https://api.formabledocs.com/v1/signature-requests.
Authorization errors
Requests fail with a401 when the bearer token is missing, malformed, revoked, or expired:
403 means the token is valid but your organization isn’t authorized for the resource — for example, creating an edit URL for a template that belongs to another organization.