feat(connector_onboarding): Add Connector onboarding APIs (#3050)

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

crates/api_models/src/connector_onboarding.rs

@@ -0,0 +1,54 @@
+use super::{admin, enums};
+
+#[derive(serde::Deserialize, serde::Serialize, Debug, Clone)]
+pub struct ActionUrlRequest {
+    pub connector: enums::Connector,
+    pub connector_id: String,
+    pub return_url: String,
+}
+
+#[derive(serde::Serialize, Debug, Clone)]
+#[serde(rename_all = "lowercase")]
+pub enum ActionUrlResponse {
+    PayPal(PayPalActionUrlResponse),
+}
+
+#[derive(serde::Deserialize, serde::Serialize, Debug, Clone)]
+pub struct OnboardingSyncRequest {
+    pub profile_id: String,
+    pub connector_id: String,
+    pub connector: enums::Connector,
+}
+
+#[derive(serde::Serialize, Debug, Clone)]
+pub struct PayPalActionUrlResponse {
+    pub action_url: String,
+}
+
+#[derive(serde::Serialize, Debug, Clone)]
+#[serde(rename_all = "lowercase")]
+pub enum OnboardingStatus {
+    PayPal(PayPalOnboardingStatus),
+}
+
+#[derive(serde::Serialize, Debug, Clone)]
+#[serde(rename_all = "snake_case")]
+pub enum PayPalOnboardingStatus {
+    AccountNotFound,
+    PaymentsNotReceivable,
+    PpcpCustomDenied,
+    MorePermissionsNeeded,
+    EmailNotVerified,
+    Success(PayPalOnboardingDone),
+    ConnectorIntegrated(admin::MerchantConnectorResponse),
+}
+
+#[derive(serde::Serialize, Debug, Clone)]
+pub struct PayPalOnboardingDone {
+    pub payer_id: String,
+}
+
+#[derive(serde::Serialize, Debug, Clone)]
+pub struct PayPalIntegrationDone {
+    pub connector_id: String,
+}