feat: add retrieve checkout session

src/resources.rs

@@ -44,6 +44,12 @@ mod billing {
     pub mod usage_record_ext;
 }
 
+#[path = "resources"]
+#[cfg(feature = "checkout")]
+mod checkout {
+    pub mod checkout_session_ext;
+}
+
 #[path = "resources"]
 #[cfg(feature = "connect")]
 mod connect {
@@ -170,6 +176,7 @@ pub use {
         payment_link::*,
         item::*
     },
+    checkout_session::checkout_session_ext::*
 };
 
 #[rustfmt::skip]

src/resources/checkout_session_ext.rs

@@ -0,0 +1,17 @@
+use crate::client::{Client, Response};
+use crate::ids::CheckoutSessionId;
+use crate::params::Expand;
+use crate::resources::CheckoutSession;
+
+impl CheckoutSession {
+    /// Retrieves a Session object.
+    ///
+    /// For more details see <https://stripe.com/docs/api/checkout/sessions/retrieve>.
+    pub fn retrieve(
+        client: &Client,
+        id: &CheckoutSessionId,
+        expand: &[&str],
+    ) -> Response<CheckoutSession> {
+        client.get_query(&format!("/checkout/sessions/{}", id), &Expand { expand })
+    }
+}