ShopshelvesApi api = ShopshelvesApi. getInstance ( ) ;
 

// Check if a block is an active shop of any kind
boolean isShop = api. isShopShelf (block. getState ( ) ) ;

// Get the shop mode (BUY, SELL, DUAL, PLAYERSHELF)
Optional <ShopHelper. ShopMode > mode = api. getShopMode (block. getState ( ) ) ;

// Get the owner UUID of a player-owned shelf
Optional <UUID > owner = api. getShopOwner (block. getState ( ) ) ;
 

// Permanent 20% discount
api. setPlayerPriceModifier (playerUuid, 0.80 ) ;

// Timed 15% surcharge for 1 hour
api. setPlayerPriceModifier (playerUuid, 1.15, 60 * 60 * 1000L ) ;

// Using a live Player reference
api. setPlayerPriceModifier (player, 0.90 ) ;
api. setPlayerPriceModifier (player, 0.90, 30 * 60 * 1000L ) ;
 

// Returns the combined effective multiplier (API + command deals + global deals)
double multiplier = api. getEffectivePriceMultiplier (playerUuid ) ; // e.g. 0.80

// Check if any deal is currently active for a player
boolean hasModifier = api. hasActiveModifier (playerUuid ) ;
 

// Removes any modifier your plugin previously set for this player
api. removePlayerPriceModifier (playerUuid ) ;
api. removePlayerPriceModifier (player ) ; // live Player overload
 

// Fired before a player shop is created — cancellable
@EventHandler
public void onShopCreate (ShopShelfCreateEvent event ) {
    Player player   = event. getPlayer ( ) ;
    Location loc     = event. getLocation ( ) ;
    ShopMode mode   = event. getShopMode ( ) ;
    event. setCancelled ( true ) ; // prevent creation
}

// Fired before a shop is removed — cancellable
@EventHandler
public void onShopRemove (ShopShelfRemoveEvent event ) {
    ShopMode previous = event. getPreviousMode ( ) ;
}

// Fired before any buy or sell transaction — cancellable
@EventHandler
public void onTransaction (ShopTransactionEvent event ) {
    Player buyer   = event. getPlayer ( ) ;
    UUID   owner   = event. getShopOwnerUuid ( ) ; // null for admin shops
    double price   = event. getPrice ( ) ;
    int    amount = event. getAmount ( ) ;
    ShopTransactionEvent. TransactionType type = event. getTransactionType ( ) ; // BUY or SELL
    event. setCancelled ( true ) ; // cancel the transaction
}