curl --request POST \
  --url https://controller.platform.simplecloud.app/v0/plugin-collection-assignments \
  --header 'Content-Type: application/json' \
  --header 'X-Network-ID: <x-network-id>' \
  --header 'X-Network-Secret: <x-network-secret>' \
  --data '
{
  "persistent_server_id": "<string>",
  "plugin_collection_id": "<string>",
  "server_group_id": "<string>"
}
'

{
  "created_at": "<string>",
  "created_plugin_assignments": 123,
  "id": "<string>",
  "mc_network_id": "<string>",
  "persistent_server_id": "<string>",
  "plugin_collection_id": "<string>",
  "plugin_collection_name": "<string>",
  "server_group_id": "<string>",
  "skipped_plugin_assignments": 123,
  "updated_at": "<string>"
}