That would be great! I've only had a quick look at the docs, but the API seems reasonable:
https://docs.joinmastodon.org/methods/apps/oauth/ https://docs.joinmastodon.org/methods/statuses/
https://docs.joinmastodon.org/methods/apps/oauth/ https://docs.joinmastodon.org/methods/statuses/
Do you know of a public service that exists i could build/test the Apprise plugin against? Would love just even temporary access to a server to perfect its design (then my account could be terminated)