feat(router): Add payment link support (#2105)

Co-authored-by: Sahkal Poddar <sahkal.poddar@juspay.in>
Co-authored-by: Kashif <46213975+kashif-m@users.noreply.github.com>
Co-authored-by: Kashif <mohammed.kashif@juspay.in>
Co-authored-by: Bernard Eugine <114725419+bernard-eugine@users.noreply.github.com>

crates/router/src/db/payment_link.rs

@@ -0,0 +1,66 @@
+use error_stack::IntoReport;
+
+use super::{MockDb, Store};
+use crate::{
+    connection,
+    core::errors::{self, CustomResult},
+    types::storage,
+};
+
+#[async_trait::async_trait]
+pub trait PaymentLinkInterface {
+    async fn find_payment_link_by_payment_link_id(
+        &self,
+        payment_link_id: &str,
+    ) -> CustomResult<storage::PaymentLink, errors::StorageError>;
+
+    async fn insert_payment_link(
+        &self,
+        _payment_link: storage::PaymentLinkNew,
+    ) -> CustomResult<storage::PaymentLink, errors::StorageError>;
+}
+
+#[async_trait::async_trait]
+impl PaymentLinkInterface for Store {
+    async fn find_payment_link_by_payment_link_id(
+        &self,
+        payment_link_id: &str,
+    ) -> CustomResult<storage::PaymentLink, errors::StorageError> {
+        let conn = connection::pg_connection_read(self).await?;
+        storage::PaymentLink::find_link_by_payment_link_id(&conn, payment_link_id)
+            .await
+            .map_err(Into::into)
+            .into_report()
+    }
+
+    async fn insert_payment_link(
+        &self,
+        payment_link_object: storage::PaymentLinkNew,
+    ) -> CustomResult<storage::PaymentLink, errors::StorageError> {
+        let conn = connection::pg_connection_write(self).await?;
+        payment_link_object
+            .insert(&conn)
+            .await
+            .map_err(Into::into)
+            .into_report()
+    }
+}
+
+#[async_trait::async_trait]
+impl PaymentLinkInterface for MockDb {
+    async fn insert_payment_link(
+        &self,
+        _payment_link: storage::PaymentLinkNew,
+    ) -> CustomResult<storage::PaymentLink, errors::StorageError> {
+        // TODO: Implement function for `MockDb`
+        Err(errors::StorageError::MockDbError)?
+    }
+
+    async fn find_payment_link_by_payment_link_id(
+        &self,
+        _payment_link_id: &str,
+    ) -> CustomResult<storage::PaymentLink, errors::StorageError> {
+        // TODO: Implement function for `MockDb`x
+        Err(errors::StorageError::MockDbError)?
+    }
+}