Include payload in integrity controls

examples/api_curl.rs

@@ -31,6 +31,10 @@ struct Args {
     #[arg(short('X'), long, default_value = "GET")]
     method: String,
 
+    /// Payload SHA256 digest
+    #[arg(short('D'), long)]
+    payload_digest: Option<String>,
+
     /// Request URI
     uri: String,
 
@@ -59,6 +63,7 @@ fn main() {
         custom: TokenClaims {
             method: args.method.to_string(),
             uri: args.uri,
+            payload_sha256: args.payload_digest.clone(),
         },
     };