feat(core): add payments post_session_tokens flow (#6202)

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

crates/api_models/src/events/payment.rs

@@ -23,7 +23,8 @@ use crate::{
         PaymentsCompleteAuthorizeRequest, PaymentsDynamicTaxCalculationRequest,
         PaymentsDynamicTaxCalculationResponse, PaymentsExternalAuthenticationRequest,
         PaymentsExternalAuthenticationResponse, PaymentsIncrementalAuthorizationRequest,
-        PaymentsManualUpdateRequest, PaymentsManualUpdateResponse, PaymentsRejectRequest,
+        PaymentsManualUpdateRequest, PaymentsManualUpdateResponse,
+        PaymentsPostSessionTokensRequest, PaymentsPostSessionTokensResponse, PaymentsRejectRequest,
         PaymentsRequest, PaymentsResponse, PaymentsRetrieveRequest, PaymentsSessionResponse,
         PaymentsStartRequest, RedirectionResponse,
     },
@@ -71,6 +72,22 @@ impl ApiEventMetric for PaymentsDynamicTaxCalculationRequest {
     }
 }
 
+impl ApiEventMetric for PaymentsPostSessionTokensRequest {
+    fn get_api_event_type(&self) -> Option<ApiEventsType> {
+        Some(ApiEventsType::Payment {
+            payment_id: self.payment_id.clone(),
+        })
+    }
+}
+
+impl ApiEventMetric for PaymentsPostSessionTokensResponse {
+    fn get_api_event_type(&self) -> Option<ApiEventsType> {
+        Some(ApiEventsType::Payment {
+            payment_id: self.payment_id.clone(),
+        })
+    }
+}
+
 impl ApiEventMetric for PaymentsDynamicTaxCalculationResponse {}
 
 impl ApiEventMetric for PaymentsCancelRequest {

crates/api_models/src/payments.rs

@@ -3819,6 +3819,7 @@ pub enum QrCodeInformation {
 #[serde(rename_all = "snake_case")]
 pub struct SdkNextActionData {
     pub next_action: NextActionCall,
+    pub order_id: Option<String>,
 }
 
 #[derive(Clone, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize, ToSchema)]
@@ -4873,6 +4874,34 @@ pub struct PaymentsSessionRequest {
     pub merchant_connector_details: Option<admin::MerchantConnectorDetailsWrap>,
 }
 
+#[derive(Debug, serde::Deserialize, serde::Serialize, Clone, ToSchema)]
+pub struct PaymentsPostSessionTokensRequest {
+    /// The unique identifier for the payment
+    #[serde(skip_deserializing)]
+    #[schema(value_type = String)]
+    pub payment_id: id_type::PaymentId,
+    /// It's a token used for client side verification.
+    #[schema(value_type = String)]
+    pub client_secret: Secret<String>,
+    /// Payment method type
+    #[schema(value_type = PaymentMethodType)]
+    pub payment_method_type: api_enums::PaymentMethodType,
+    /// The payment method that is to be used for the payment
+    #[schema(value_type = PaymentMethod, example = "card")]
+    pub payment_method: api_enums::PaymentMethod,
+}
+
+#[derive(Debug, serde::Serialize, Clone, ToSchema)]
+pub struct PaymentsPostSessionTokensResponse {
+    /// The identifier for the payment
+    #[schema(value_type = String)]
+    pub payment_id: id_type::PaymentId,
+    /// Additional information required for redirection
+    pub next_action: Option<NextActionData>,
+    #[schema(value_type = IntentStatus, example = "failed", default = "requires_confirmation")]
+    pub status: api_enums::IntentStatus,
+}
+
 #[derive(Debug, serde::Serialize, serde::Deserialize, Clone, ToSchema)]
 pub struct PaymentsDynamicTaxCalculationRequest {
     /// The unique identifier for the payment
@@ -5429,6 +5458,8 @@ pub struct SdkNextAction {
 #[derive(Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize, Clone, ToSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum NextActionCall {
+    /// The next action call is Post Session Tokens
+    PostSessionTokens,
     /// The next action call is confirm
     Confirm,
     /// The next action call is sync