The indented use case is not supported by the Unified Location Finder API.
The main purpose of the Location Finder - Unified API is to find the nearest locations for pick-up, drop-off of shipments and related services for a given geospatial point. It’s not meant to retrieve an exhaustive list of all locations in reference to a postal code.
You can retrieve nearby delivery points using the find-by-address method with postalCode and/or countryCode as query parameters. The maximum amount of returned items per call is limited by 50 locations.
We are always open to understanding new business-driven use cases to extend our portfolio. Feel free to open a support ticket and explain your use case, with the corresponding business process behind this request.
Please note that according to this API's legal terms: You shall not store and/or modify Location Data in any form; it is especially prohibited to analyze and/or derive data/information for competitive purposes from the Location Data without our prior written consent.