feat (fix) -fix decode error in c2b apis, make conversaton id an Option<String> type and skip serialization if None

Author: c12i

mpesa_core/src/services/c2b_register.rs

@@ -20,8 +20,8 @@ struct C2bRegisterPayload<'a> {
 
 #[derive(Debug, Deserialize, Clone)]
 pub struct C2bRegisterResponse {
-    #[serde(rename(deserialize = "ConversationID"))]
-    pub conversation_id: String,
+    #[serde(rename(deserialize = "ConversationID"), skip_serializing_if = "None")]
+    pub conversation_id: Option<String>,
     #[serde(rename(deserialize = "OriginatorCoversationID"))]
     pub originator_coversation_id: String,
     #[serde(rename(deserialize = "ResponseDescription"))]

mpesa_core/src/services/c2b_simulate.rs

@@ -23,8 +23,8 @@ struct C2bSimulatePayload<'a> {
 
 #[derive(Debug, Clone, Deserialize)]
 pub struct C2bSimulateResponse {
-    #[serde(rename(deserialize = "ConversationID"))]
-    pub conversation_id: String,
+    #[serde(rename(deserialize = "ConversationID"), skip_serializing_if = "None")]
+    pub conversation_id: Option<String>,
     #[serde(rename(deserialize = "OriginatorCoversationID"))]
     pub originator_coversation_id: String,
     #[serde(rename(deserialize = "ResponseDescription"))]