feat(pm_auth): pm_auth service migration (#3047)

Co-authored-by: Sarthak Soni <76486416+Sarthak1799@users.noreply.github.com>
Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>
Co-authored-by: Sarthak Soni <sarthak.soni@juspay.in>

crates/api_models/src/pm_auth.rs

@@ -0,0 +1,57 @@
+use common_enums::{PaymentMethod, PaymentMethodType};
+use common_utils::{
+    events::{ApiEventMetric, ApiEventsType},
+    impl_misc_api_event_type,
+};
+
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "snake_case")]
+pub struct LinkTokenCreateRequest {
+    pub language: Option<String>, // optional language field to be passed
+    pub client_secret: Option<String>, // client secret to be passed in req body
+    pub payment_id: String, // payment_id to be passed in req body for redis pm_auth connector name fetch
+    pub payment_method: PaymentMethod, // payment_method to be used for filtering pm_auth connector
+    pub payment_method_type: PaymentMethodType, // payment_method_type to be used for filtering pm_auth connector
+}
+
+#[derive(Debug, Clone, serde::Serialize)]
+pub struct LinkTokenCreateResponse {
+    pub link_token: String, // link_token received in response
+    pub connector: String,  // pm_auth connector name in response
+}
+
+#[derive(Debug, Clone, serde::Deserialize, serde::Serialize)]
+#[serde(rename_all = "snake_case")]
+
+pub struct ExchangeTokenCreateRequest {
+    pub public_token: String,
+    pub client_secret: Option<String>,
+    pub payment_id: String,
+    pub payment_method: PaymentMethod,
+    pub payment_method_type: PaymentMethodType,
+}
+
+#[derive(Debug, Clone, serde::Serialize)]
+pub struct ExchangeTokenCreateResponse {
+    pub access_token: String,
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct PaymentMethodAuthConfig {
+    pub enabled_payment_methods: Vec<PaymentMethodAuthConnectorChoice>,
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct PaymentMethodAuthConnectorChoice {
+    pub payment_method: PaymentMethod,
+    pub payment_method_type: PaymentMethodType,
+    pub connector_name: String,
+    pub mca_id: String,
+}
+
+impl_misc_api_event_type!(
+    LinkTokenCreateRequest,
+    LinkTokenCreateResponse,
+    ExchangeTokenCreateRequest,
+    ExchangeTokenCreateResponse
+);