Update GET/POST affiliation endpoints to support sandbox env

auth-api/src/auth_api/utils/util.py

@@ -74,11 +74,15 @@ def mask_email(email: str) -> str:
 
 def get_request_environment():
     """Return the environment corresponding to the user request."""
-    env = None
-    sandbox_host = current_app.config["AUTH_WEB_SANDBOX_HOST"]
-    if os.getenv("FLASK_ENV") == "production" and sandbox_host in request.host_url:
-        env = "sandbox"
-    return env
+    env_override = request.headers.get('Environment-Override')
+    sandbox_host = current_app.config.get("AUTH_WEB_SANDBOX_HOST")
+    is_production = os.getenv("FLASK_ENV") == "production"
+
+    if env_override:
+        return env_override
+    if is_production and sandbox_host in request.host_url:
+        return "sandbox"
+    return None
 
 
 def extract_numbers(input_string: str):