Custom providers

Subclass UServerQueuePermissionProvider or UServerQueueAuthProvider (Providers/ServerQueueProviders.h). Add the class to the settings (Permission Providers or Auth Provider), or pass its path on the server command line with -QueuePermissionProvider= or -QueueAuthProvider=.

Both get an FServerQueuePlayerInfo:

Field	Description
PlayerKey	Queue key, <IdType>:<Id>
PlayerId	The player id as text, for example a SteamID64
IdType	Online platform of the id, for example STEAM, EOS or NULL
AuthTicket	The ticket the client sent. Empty unless an auth provider is set

Call the completion delegate exactly once, now or later. Reload() is called when the queue starts and on ServerQueue.Reload.

Permission provider

UCLASS(meta = (DisplayName = "My Backend"))
class UMyPermissionProvider : public UServerQueuePermissionProvider
{
	GENERATED_BODY()

public:
	virtual void ResolvePriority(const FServerQueuePlayerInfo& Player, FServerQueueOnPriorityResolved OnComplete) override
	{
		// Look the player up, now or asynchronously. Return Regular when unknown.
		OnComplete.ExecuteIfBound(IsSupporter(Player.PlayerId) ? EServerQueuePriority::Supporter : EServerQueuePriority::Regular);
	}
};

Auth provider

UCLASS(meta = (DisplayName = "My Backend"))
class UMyAuthProvider : public UServerQueueAuthProvider
{
	GENERATED_BODY()

public:
	virtual void VerifyPlayer(const FServerQueuePlayerInfo& Player, FServerQueueOnPlayerVerified OnComplete) override
	{
		// The reason is logged on the server when the player is refused.
		const bool bValid = CheckTicket(Player.PlayerId, Player.AuthTicket);
		OnComplete.ExecuteIfBound(bValid, bValid ? FString() : TEXT("ticket rejected"));
	}
};