1070: template_id is required: a batch sends one of your invitation templates to every recipient

template_id is required: a batch sends one of your invitation templates to every recipient. This is an HTTP 422: the request parsed but a value is not acceptable.

• Check this endpoint’s request schema in the API reference; param in the response names the exact field at fault.
• Use an official SDK, which enforces required fields and types before the call is made.