Initializes minting for a Custom Bill of Lading (Custom EBL) from a base64 payload, signs it as a verifiable credential, uploads it to storage, and returns a signing redirect URL

Notes

• shipperDomain is used as signing domain (dns) for DID context.
• Minting maps:
  • beneficiaryAddress → beneficiary
  • holderAddress → holder
• This endpoint initializes minting only; user must complete signing via returned URL.

This API returns a redirect URL with sessionId to sign the transaction.
Use the GET endpoint /auth/session-response?sessionId=<sessionId> to retrieve the session result.
The response will include an object under the key wrappedDocument, which contains the content of the .tt file.

If using MCP, enter shipperDomain, holderAddress, and beneficiaryAddress explicitly.