Derives payTo from the live 402 challenge if not supplied, first tries the CDP n...
https://denk.halowerk.com/v1/bazaar-listing-checkOverview
Derives payTo from the live 402 challenge if not supplied, first tries the CDP natural-language search filtered by payTo, then paginates the CDP merchant discovery list for that payTo (100 entries per page, the CDP maximum; parallel, up to 400 pages, failed pages are retried within the time budget) and looks for the exact resource URL. "not_listed" is only returned after a complete scan with a stable total; otherwise the verdict is "unknown".