diff --git a/src/client.rs b/src/client.rs
index 0e7b7c37a..65c87ee7b 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -14,9 +14,9 @@ use serde_json::Value;
 use std::cell::RefCell;
 
 /// Source: [test credentials](https://developer.safaricom.co.ke/test_credentials)
-static DEFAULT_INITIATOR_PASSWORD: &str = "Safcom496!";
+const DEFAULT_INITIATOR_PASSWORD: &str = "Safcom496!";
 /// Get current package version from metadata
-static CARGO_PACKAGE_VERSION: &str = env!("CARGO_PKG_VERSION");
+const CARGO_PACKAGE_VERSION: &str = env!("CARGO_PKG_VERSION");
 
 /// `Result` enum type alias
 pub type MpesaResult<T> = Result<T, MpesaError>;
diff --git a/src/services/c2b_register.rs b/src/services/c2b_register.rs
index 82635bcdf..fe214e7e6 100644
--- a/src/services/c2b_register.rs
+++ b/src/services/c2b_register.rs
@@ -19,11 +19,6 @@ struct C2bRegisterPayload<'mpesa> {
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct C2bRegisterResponse {
-    #[serde(
-        rename(deserialize = "ConversationID"),
-        skip_serializing_if = "Option::is_none"
-    )]
-    pub conversation_id: Option<String>,
     #[serde(rename(deserialize = "OriginatorConverstionID"))]
     pub originator_conversation_id: String,
     #[serde(rename(deserialize = "ResponseCode"))]
diff --git a/tests/mpesa-rust/c2b_register_test.rs b/tests/mpesa-rust/c2b_register_test.rs
index 030c5fb4c..c50815455 100644
--- a/tests/mpesa-rust/c2b_register_test.rs
+++ b/tests/mpesa-rust/c2b_register_test.rs
@@ -32,7 +32,6 @@ async fn c2b_register_success() {
         "Accept the service request successfully."
     );
     assert_eq!(response.response_code, "0");
-    assert_eq!(response.conversation_id, None);
 }
 
 #[tokio::test]
diff --git a/tests/mpesa-rust/helpers.rs b/tests/mpesa-rust/helpers.rs
index 01dfcfaf5..a6f13cf60 100644
--- a/tests/mpesa-rust/helpers.rs
+++ b/tests/mpesa-rust/helpers.rs
@@ -90,14 +90,4 @@ mod tests {
         );
         assert!(!client.is_connected().await);
     }
-
-    #[tokio::test]
-    async fn test_client_will_not_authenticate_with_sandbox_credentials_in_production() {
-        let client = get_mpesa_client!(
-            std::env::var("CLIENT_KEY").unwrap(),
-            std::env::var("CLIENT_SECRET").unwrap(),
-            Environment::from_str("production").unwrap()
-        );
-        assert!(!client.is_connected().await);
-    }
 }