start implementation of paid invitation links

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/invite_links/CreateChatInviteLink.kt

@@ -4,6 +4,8 @@ import korlibs.time.DateTime
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
 import dev.inmo.tgbotapi.requests.chat.abstracts.*
 import dev.inmo.tgbotapi.types.*
+import korlibs.time.TimeSpan
+import korlibs.time.days
 import kotlinx.serialization.*
 
 sealed interface CreateChatInviteLink<R : SecondaryChatInviteLink> : EditChatInviteLinkRequest<R> {
@@ -12,6 +14,11 @@ sealed interface CreateChatInviteLink<R : SecondaryChatInviteLink> : EditChatInv
         get() = expirationUnixTimeStamp ?.asDate
     override fun method(): String = "createChatInviteLink"
 
+    sealed interface Subscription : CreateChatInviteLink<ChatInviteLinkUnlimited> {
+        val subscriptionPeriod: TimeSpan
+        val subscriptionPrice: UInt
+    }
+
     companion object {
         fun unlimited(
             chatId: ChatIdentifier,
@@ -45,6 +52,13 @@ sealed interface CreateChatInviteLink<R : SecondaryChatInviteLink> : EditChatInv
             expiration: DateTime,
             name: String? = null,
         ) = withJoinRequest(chatId, name, expiration.toTelegramDate())
+        fun paid(
+            chatId: ChatIdentifier,
+            subscriptionPrice: UInt,
+            subscriptionPeriod: TimeSpan = 30.days,
+            name: String? = null,
+            expirationUnixTimeStamp: TelegramDate? = null,
+        ) = CreateChatSubscriptionInviteLink(chatId, subscriptionPrice, name, subscriptionPeriod, expirationUnixTimeStamp)
     }
 }
 
@@ -71,6 +85,33 @@ data class CreateChatInviteLinkUnlimited(
         get() = ChatInviteLinkUnlimited.serializer()
 }
 
+/**
+ * Represent [https://core.telegram.org/bots/api#createchatsubscriptioninvitelink] request
+ *
+ * @see CreateChatInviteLink.unlimited
+ * @see CreateChatInviteLinkWithLimitedMembers
+ * @see CreateChatInviteLinkWithJoinRequest
+ */
+@Serializable
+data class CreateChatSubscriptionInviteLink(
+    @SerialName(chatIdField)
+    override val chatId: ChatIdentifier,
+    @SerialName(subscriptionPriceField)
+    override val subscriptionPrice: UInt,
+    @SerialName(nameField)
+    override val name: String? = null,
+    @SerialName(subscriptionPeriodField)
+    @EncodeDefault
+    override val subscriptionPeriod: TimeSpan = 30.days,
+    @SerialName(expireDateField)
+    override val expirationUnixTimeStamp: TelegramDate? = null,
+) : CreateChatInviteLink.Subscription {
+    override val requestSerializer: SerializationStrategy<*>
+        get() = serializer()
+    override val resultDeserializer: DeserializationStrategy<ChatInviteLinkUnlimited>
+        get() = ChatInviteLinkUnlimited.serializer()
+}
+
 /**
  * Represent [https://core.telegram.org/bots/api#createchatinvitelink] request WITH `member_limit`
  * and WITHOUT `creates_join_request`

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/types/Common.kt

@@ -457,6 +457,8 @@ const val permissionsField = "permissions"
 const val typeField = "type"
 const val valueField = "value"
 const val creatorField = "creator"
+const val subscriptionPeriodField = "subscription_period"
+const val subscriptionPriceField = "subscription_price"
 
 const val pointField = "point"
 const val xShiftField = "x_shift"