acoustid works by generating a hash of the recording and providing a web service to look up that information.
It is not perfect and it is possible for 2 recordings to have the same acoustid so you may want to look at other tags to pick the best one.
acoustid typically will contain a musicbrainz recording id allowing you to query that service for more information.
https://acoustid.org/webservice
The general process you will want to do:
generate your acoustid as a string of numers and letters.
Query the acoustid web service, include meta=recordingids so you get musicbrainz recording identifiers.
parse the results,
Query the musicbrainz web service for more information on each recording.
From the example in the documentation cd2e7c47-16f5-46c6-a37c-a1eb7bf599ff was one of the recordings that matched the acoustid.
You will then want to querying the musicbrainz web service with something like the following.
https://musicbrainz.org/ws/2/recording/cd2e7c47-16f5-46c6-a37c-a1eb7bf599ff?inc=artists+releases&fmt=json
See https://wiki.musicbrainz.org/Development/XML_Web_Service/Version_2 for the musicbrainz web service.