To become an EDM ghost producer, you have to be able to create outstanding dance music tracks from scratch and be willing to give the track up completely, signing over all rights to the buyer. Tracks must have catchy sound design, interesting arrangement tricks and high-quality mixing and mastering...
In the EDM world, the relationship begins when an artist/DJ goes to a ghost production platform, finds a track or song they like and pays a one-time fee for the rights to it. From then on, the artist can use the song as their own and all streaming/performing income goes to them.
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A ghost producer produces tracks for other artists, without being mentioned on the credits. They usually waive all copyright to the buyer, who pays the ghost producer a flat fee and is entitled to all royalties from further use of the track...