feat(router): add payments incremental authorization api (#3038)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/api_models/src/payments.rs

@@ -2209,6 +2209,12 @@ pub struct PaymentsResponse {
 
     /// If true incremental authorization can be performed on this payment
     pub incremental_authorization_allowed: Option<bool>,
+
+    /// Total number of authorizations happened in an incremental_authorization payment
+    pub authorization_count: Option<i32>,
+
+    /// List of incremental authorizations happened to the payment
+    pub incremental_authorizations: Option<Vec<IncrementalAuthorizationResponse>>,
 }
 
 #[derive(Clone, Debug, serde::Deserialize, ToSchema, serde::Serialize)]
@@ -2277,6 +2283,24 @@ pub struct PaymentListResponse {
     // The list of payments response objects
     pub data: Vec<PaymentsResponse>,
 }
+
+#[derive(Setter, Clone, Default, Debug, PartialEq, serde::Serialize, ToSchema)]
+pub struct IncrementalAuthorizationResponse {
+    /// The unique identifier of authorization
+    pub authorization_id: String,
+    /// Amount the authorization has been made for
+    pub amount: i64,
+    #[schema(value_type= AuthorizationStatus)]
+    /// The status of the authorization
+    pub status: common_enums::AuthorizationStatus,
+    /// Error code sent by the connector for authorization
+    pub error_code: Option<String>,
+    /// Error message sent by the connector for authorization
+    pub error_message: Option<String>,
+    /// Previously authorized amount for the payment
+    pub previously_authorized_amount: i64,
+}
+
 #[derive(Clone, Debug, serde::Serialize)]
 pub struct PaymentListResponseV2 {
     /// The number of payments included in the list for given constraints
@@ -2985,6 +3009,18 @@ pub struct PaymentsCancelRequest {
     pub merchant_connector_details: Option<admin::MerchantConnectorDetailsWrap>,
 }
 
+#[derive(Default, Debug, serde::Serialize, serde::Deserialize, Clone, ToSchema)]
+pub struct PaymentsIncrementalAuthorizationRequest {
+    /// The identifier for the payment
+    #[serde(skip)]
+    pub payment_id: String,
+    /// The total amount including previously authorized amount and additional amount
+    #[schema(value_type = i64, example = 6540)]
+    pub amount: i64,
+    /// Reason for incremental authorization
+    pub reason: Option<String>,
+}
+
 #[derive(Default, Debug, serde::Deserialize, serde::Serialize, Clone, ToSchema)]
 pub struct PaymentsApproveRequest {
     /// The identifier for the payment