First you must subscribe to the HIPAA FORMS Service API.
A free option is available but is limited to 1 form and up to 25 submissions per month, no credit card is required and you can upgrade to the standard option for unlimited forms & submissions at any time for $55/mo.
This service is what handles the storage and PDF generation of the forms and forms CAN NOT be submitted without a subscription.
Once you subscribe to the service a license key will be generated and emailed to you. Visit HIPAA FORMS Service to get a license key.