feat: payment processor token for recurring payments (#5508)

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

crates/api_models/src/mandates.rs

@@ -120,4 +120,14 @@ pub struct MandateListConstraints {
 pub enum RecurringDetails {
     MandateId(String),
     PaymentMethodId(String),
+    ProcessorPaymentToken(ProcessorPaymentToken),
+}
+
+/// Processor payment token for MIT payments where payment_method_data is not available
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, ToSchema)]
+pub struct ProcessorPaymentToken {
+    pub processor_payment_token: String,
+    #[schema(value_type = Connector, example = "stripe")]
+    pub connector: api_enums::Connector,
+    pub merchant_connector_id: String,
 }