The api code never mention webapp_name.

Maybe the param was a wish.

allgo/__init__.py

@@ -255,7 +255,7 @@ class Client:
             with the Response status code if it's not 200.
         """
         data = {
-            "job[webapp_name]": app,
+            # ~ "job[webapp_name]": app,
             "job[webapp_id]"  : app,
             "job[param]"      : params,
             "job[version]"    : version,