diff --git a/lnurl/models.py b/lnurl/models.py
index 6e009ec..6079353 100644
--- a/lnurl/models.py
+++ b/lnurl/models.py
@@ -249,7 +249,10 @@ def is_valid_amount(self, amount: int) -> bool:
 
 
 def is_pay_action_response(data: dict) -> bool:
-    return "pr" in data and "routes" in data
+    # LUD-06: LnurlPayActionResponse is identified by just the presence of "pr".
+    # "routes" is specified as required in the spec as empty array;
+    # some services falsely omit it, so we are only checking for "pr".
+    return "pr" in data
 
 
 class LnurlResponse:
diff --git a/tests/test_pay_action_response_lud06.py b/tests/test_pay_action_response_lud06.py
new file mode 100644
index 0000000..38d5f20
--- /dev/null
+++ b/tests/test_pay_action_response_lud06.py
@@ -0,0 +1,78 @@
+from lnurl import LnurlErrorResponse
+from lnurl.models import LnurlPayActionResponse, LnurlResponse
+
+
+def test_from_dict_pay_action_response_without_routes():
+    """
+    LUD-06 success form: callback response that only contains `pr`
+    (and optional fields like `successAction`, `disposable`) MUST
+    be parsed as LnurlPayActionResponse even when `routes` is omitted.
+    """
+    data = {
+        "pr": (
+            "lnbc1pnsu5z3pp57getmdaxhg5kc9yh2a2qsh7cjf4gnccgkw0qenm8vsqv50w7s"
+            "ygqdqj0fjhymeqv9kk7atwwscqzzsxqyz5vqsp5e2yyqcp0a3ujeesp24ya0glej"
+            "srh703md8mrx0g2lyvjxy5w27ss9qxpqysgqyjreasng8a086kpkczv48er5c6l5"
+            "73aym6ynrdl9nkzqnag49vt3sjjn8qdfq5cr6ha0vrdz5c5r3v4aghndly0hplmv"
+            "6hjxepwp93cq398l3s"
+        ),
+        "successAction": {
+            "tag": "message",
+            "message": "LNURL pay to user@example.com",
+        },
+        "disposable": False,
+        # NOTE: `routes` is intentionally omitted here.
+    }
+
+    res = LnurlResponse.from_dict(data)
+
+    assert isinstance(res, LnurlPayActionResponse)
+    assert res.pr == data["pr"]
+    assert res.successAction is not None
+    assert res.disposable is False
+
+
+def test_from_dict_pay_action_response_pr_only_no_status():
+    """
+    Regression test for the original reported error:
+        LnurlResponseException: Expected Success or Error response. But no 'status' given.
+
+    A callback response body that contains only `pr` (no `routes`, no `status`) must
+    not raise that exception — it must be parsed as LnurlPayActionResponse.
+    Even though LUD06 specified an required empty `routes` array some services omit it.
+    """
+    data = {
+        "pr": (
+            "lnbc1pnsu5z3pp57getmdaxhg5kc9yh2a2qsh7cjf4gnccgkw0qenm8vsqv50w7s"
+            "ygqdqj0fjhymeqv9kk7atwwscqzzsxqyz5vqsp5e2yyqcp0a3ujeesp24ya0glej"
+            "srh703md8mrx0g2lyvjxy5w27ss9qxpqysgqyjreasng8a086kpkczv48er5c6l5"
+            "73aym6ynrdl9nkzqnag49vt3sjjn8qdfq5cr6ha0vrdz5c5r3v4aghndly0hplmv"
+            "6hjxepwp93cq398l3s"
+        ),
+        # NOTE: no `routes`, no `status` — the minimal real-world payload that
+        # triggered "Expected Success or Error response. But no 'status' given."
+    }
+
+    res = LnurlResponse.from_dict(data)
+
+    assert isinstance(res, LnurlPayActionResponse)
+    assert res.pr == data["pr"]
+    assert res.routes == []
+
+
+def test_from_dict_error_response_with_status_error():
+    """
+    LUD-06 error form: any response shaped as
+        {"status": "ERROR", "reason": "error details..."}
+    must be parsed as LnurlErrorResponse with the correct reason.
+    """
+    data = {
+        "status": "ERROR",
+        "reason": "error details...",
+    }
+
+    res = LnurlResponse.from_dict(data)
+
+    assert isinstance(res, LnurlErrorResponse)
+    assert res.reason == "error details..."
+    assert res.ok is False