# Validate hyperline credentials

> POST /connections/hyperline/validate

Source: https://docs.trykintsugi.com/reference/2026-07-21/validate-hyperline-credentials

POST /connections/hyperline/validate

Validate hyperline credentials

Probe a Hyperline API key without persisting a connection, returning the companies and invoicing entities available under it for the connect picker. Returns 400 if the key is invalid.

Category: Connections

Request body:
apiKey (string, required) - Hyperline API key to probe.

Response fields:
entities (HyperlineValidateEntity[]) - Invoicing entities available under the validated key.
  id (string, required) - Hyperline entity id.
  name (string, required) - Hyperline entity display name.
  companyId (string) - Owning company id.
  timezone (string) - Entity timezone.
companies (HyperlineValidateCompany[]) - Companies available under the validated key.
  id (string, required) - Hyperline company id.
  name (string, required) - Hyperline company display name.
environment (string) - Hyperline environment the key resolved against.

Response statuses: 200, 400, 401, 403, 404, 422

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