Processes a lien filing submission.

This endpoint performs the following steps:

1. Validates the lien form for completeness and accuracy.
2. If valid, changes the status from 'Draft' to 'Requested'.
3. Initiates the submission for further processing.

Required fields vary by filing type:

UCC1 filings:

• email_contact
• collateral_statements
• secured_parties (at least one)
• submission_principal_indebted_amount (Tennessee only)
• submission_documentary_tax_stamp_required (Florida only)

UCC3 filings:

• email_contact
• amendment_action
• authorizing_party

Note: Once submitted, the lien filing becomes unmodifiable.
It will undergo review and processing, potentially resulting
in official filing with the appropriate jurisdiction.