diff --git a/examples/checkout.rs b/examples/checkout.rs
index da7ba1c9b..e95bba957 100644
--- a/examples/checkout.rs
+++ b/examples/checkout.rs
@@ -28,9 +28,10 @@ async fn main() {
             description: Some(
                 "A fake customer that is used to illustrate the examples in async-stripe.",
             ),
-            metadata: Some(
-                [("async-stripe".to_string(), "true".to_string())].iter().cloned().collect(),
-            ),
+            metadata: Some(std::collections::HashMap::from([(
+                String::from("async-stripe"),
+                String::from("true"),
+            )])),
 
             ..Default::default()
         },
@@ -43,8 +44,10 @@ async fn main() {
     // create a new exmaple project
     let product = {
         let mut create_product = CreateProduct::new("T-Shirt");
-        create_product.metadata =
-            Some([("async-stripe".to_string(), "true".to_string())].iter().cloned().collect());
+        create_product.metadata = Some(std::collections::HashMap::from([(
+            String::from("async-stripe"),
+            String::from("true"),
+        )]));
         Product::create(&client, create_product).await.unwrap()
     };
 
@@ -52,8 +55,10 @@ async fn main() {
     let price = {
         let mut create_price = CreatePrice::new(Currency::USD);
         create_price.product = Some(IdOrCreate::Id(&product.id));
-        create_price.metadata =
-            Some([("async-stripe".to_string(), "true".to_string())].iter().cloned().collect());
+        create_price.metadata = Some(std::collections::HashMap::from([(
+            String::from("async-stripe"),
+            String::from("true"),
+        )]));
         create_price.unit_amount = Some(1000);
         create_price.expand = &["product"];
         Price::create(&client, create_price).await.unwrap()
diff --git a/examples/customer.rs b/examples/customer.rs
index 67711f633..b831ac517 100644
--- a/examples/customer.rs
+++ b/examples/customer.rs
@@ -22,9 +22,10 @@ async fn main() {
             description: Some(
                 "A fake customer that is used to illustrate the examples in async-stripe.",
             ),
-            metadata: Some(
-                [("async-stripe".to_string(), "true".to_string())].iter().cloned().collect(),
-            ),
+            metadata: Some(std::collections::HashMap::from([(
+                String::from("async-stripe"),
+                String::from("true"),
+            )])),
 
             ..Default::default()
         },
@@ -42,9 +43,10 @@ async fn main() {
             description: Some(
                 "A fake customer that is used to illustrate the examples in async-stripe.",
             ),
-            metadata: Some(
-                [("async-stripe".to_string(), "true".to_string())].iter().cloned().collect(),
-            ),
+            metadata: Some(std::collections::HashMap::from([(
+                String::from("async-stripe"),
+                String::from("true"),
+            )])),
 
             ..Default::default()
         },
diff --git a/examples/payment-intent.rs b/examples/payment-intent.rs
index a3b067dea..3384e411c 100644
--- a/examples/payment-intent.rs
+++ b/examples/payment-intent.rs
@@ -26,9 +26,10 @@ async fn main() {
             description: Some(
                 "A fake customer that is used to illustrate the examples in async-stripe.",
             ),
-            metadata: Some(
-                [("async-stripe".to_string(), "true".to_string())].iter().cloned().collect(),
-            ),
+            metadata: Some(std::collections::HashMap::from([(
+                String::from("async-stripe"),
+                String::from("true"),
+            )])),
 
             ..Default::default()
         },
diff --git a/examples/payment-link.rs b/examples/payment-link.rs
index 4f9d70dc0..bd2a353f0 100644
--- a/examples/payment-link.rs
+++ b/examples/payment-link.rs
@@ -20,8 +20,10 @@ async fn main() {
     // create a new example project
     let product = {
         let mut create_product = CreateProduct::new("T-Shirt");
-        create_product.metadata =
-            Some([("async-stripe".to_string(), "true".to_string())].iter().cloned().collect());
+        create_product.metadata = Some(std::collections::HashMap::from([(
+            String::from("async-stripe"),
+            String::from("true"),
+        )]));
         Product::create(&client, create_product).await.unwrap()
     };
 
@@ -29,8 +31,10 @@ async fn main() {
     let price = {
         let mut create_price = CreatePrice::new(Currency::USD);
         create_price.product = Some(IdOrCreate::Id(&product.id));
-        create_price.metadata =
-            Some([("async-stripe".to_string(), "true".to_string())].iter().cloned().collect());
+        create_price.metadata = Some(std::collections::HashMap::from([(
+            String::from("async-stripe"),
+            String::from("true"),
+        )]));
         create_price.unit_amount = Some(1000);
         create_price.expand = &["product"];
         Price::create(&client, create_price).await.unwrap()
diff --git a/examples/subscriptions.rs b/examples/subscriptions.rs
index 10c5bac4b..391fc08b1 100644
--- a/examples/subscriptions.rs
+++ b/examples/subscriptions.rs
@@ -26,9 +26,10 @@ async fn main() {
             description: Some(
                 "A fake customer that is used to illustrate the examples in async-stripe.",
             ),
-            metadata: Some(
-                [("async-stripe".to_string(), "true".to_string())].iter().cloned().collect(),
-            ),
+            metadata: Some(std::collections::HashMap::from([(
+                String::from("async-stripe"),
+                String::from("true"),
+            )])),
 
             ..Default::default()
         },
@@ -76,8 +77,10 @@ async fn main() {
     // create a new exmaple project
     let product = {
         let mut create_product = CreateProduct::new("Monthly T-Shirt Subscription");
-        create_product.metadata =
-            Some([("async-stripe".to_string(), "true".to_string())].iter().cloned().collect());
+        create_product.metadata = Some(std::collections::HashMap::from([(
+            String::from("async-stripe"),
+            String::from("true"),
+        )]));
         Product::create(&client, create_product).await.unwrap()
     };
 
@@ -85,8 +88,10 @@ async fn main() {
     let price = {
         let mut create_price = CreatePrice::new(Currency::USD);
         create_price.product = Some(IdOrCreate::Id(&product.id));
-        create_price.metadata =
-            Some([("async-stripe".to_string(), "true".to_string())].iter().cloned().collect());
+        create_price.metadata = Some(std::collections::HashMap::from([(
+            String::from("async-stripe"),
+            String::from("true"),
+        )]));
         create_price.unit_amount = Some(1000);
         create_price.recurring = Some(CreatePriceRecurring {
             interval: CreatePriceRecurringInterval::Month,