Create a single borrower + loan application carrying 1-3 requested products
(product_uids), then obtain a DigiFi decision for EACH requested product.
Decisions are persisted under the returned thrive_application_uid and can be
retrieved via POST /v2/application/get-application-decision.

Request format: Supports two content types:

• application/json – Send the full application payload as JSON. Use when none of the requested products require drivers license upload.
• multipart/form-data – Use when ANY requested product has promo type ZIL, NO_NO, or NO_YES. Include a data field (JSON string of the
  application payload) plus drivers_license_front and drivers_license_back file uploads.

ZIL, NO_NO, and NO_YES products: When any requested product has promo type ZIL, NO_NO, or NO_YES, the payload must
include all required borrower and license fields (employment status, employer name, occupation, occupation years,
license number, state of issuance, date of issuance, expiration date). For these promo types, drivers license
front and back files are required and must be sent via multipart/form-data.