diff --git a/src/Model/Promotion.php b/src/Model/Promotion.php
index 852b915..f6705a0 100644
--- a/src/Model/Promotion.php
+++ b/src/Model/Promotion.php
@@ -61,13 +61,7 @@ public function __construct()
 
     public function __toString(): string
     {
-        $name = (string) $this->getName();
-
-        if ('' === $name) {
-            return (string) $this->getId();
-        }
-
-        return $name;
+        return (string) ($this->getName() ?? $this->getCode() ?? $this->getId());
     }
 
     public function getMultiplier(): float
@@ -75,13 +69,6 @@ public function getMultiplier(): float
         return 1 - $this->getDiscount();
     }
 
-    public function getChannelCodes(): array
-    {
-        return $this->channels->map(static function (BaseChannelInterface $channel): string {
-            return (string) $channel->getCode();
-        })->toArray();
-    }
-
     public function getId(): ?int
     {
         return $this->id;
@@ -211,11 +198,6 @@ public function getDiscount(): float
         return (float) $this->discount;
     }
 
-    public function getDisplayableDiscount(): float
-    {
-        return $this->getDiscount() * 100;
-    }
-
     public function setDiscount(float $discount): void
     {
         $this->discount = (string) $discount;
diff --git a/src/Model/PromotionInterface.php b/src/Model/PromotionInterface.php
index 0e138c3..fa6aa47 100644
--- a/src/Model/PromotionInterface.php
+++ b/src/Model/PromotionInterface.php
@@ -11,19 +11,12 @@
 use Sylius\Component\Resource\Model\ResourceInterface;
 use Sylius\Component\Resource\Model\TimestampableInterface;
 
-interface PromotionInterface extends ChannelsAwareInterface, CodeAwareInterface, TimestampableInterface, ResourceInterface
+interface PromotionInterface extends ChannelsAwareInterface, CodeAwareInterface, TimestampableInterface, ResourceInterface, \Stringable
 {
     public function getId(): ?int;
 
-    public function __toString(): string;
-
     public function getMultiplier(): float;
 
-    /**
-     * @return string[]
-     */
-    public function getChannelCodes(): array;
-
     public function getName(): ?string;
 
     public function setName(?string $name): void;
@@ -72,7 +65,5 @@ public function removeRule(PromotionRuleInterface $rule): void;
 
     public function getDiscount(): float;
 
-    public function getDisplayableDiscount(): float;
-
     public function setDiscount(float $discount): void;
 }