diff --git a/discord/state.py b/discord/state.py
index 344a60013..0428ce0b6 100644
--- a/discord/state.py
+++ b/discord/state.py
@@ -101,6 +101,7 @@ from .audit_logs import AuditLogEntry
 from .read_state import ReadState
 from .tutorial import Tutorial
 from .experiment import UserExperiment, GuildExperiment
+from .metadata import Metadata
 
 if TYPE_CHECKING:
     from typing_extensions import Self
@@ -2006,8 +2007,8 @@ class ConnectionState:
         self.dispatch(
             'billing_popup_bridge_callback',
             try_enum(PaymentSourceType, data.get('payment_source_type', 0)),
-            data.get('path'),
-            data.get('query'),
+            data.get('path', ''),
+            Metadata(data.get('query', {})),
             data.get('state'),
         )
 
diff --git a/discord/types/gateway.py b/discord/types/gateway.py
index 74135fd2b..2615fd4af 100644
--- a/discord/types/gateway.py
+++ b/discord/types/gateway.py
@@ -497,7 +497,7 @@ class BillingPopupBridgeCallbackEvent(TypedDict):
     payment_source_type: int
     state: str
     path: str
-    query: str
+    query: Dict[str, str]
 
 
 PaymentUpdateEvent = Payment
diff --git a/docs/api.rst b/docs/api.rst
index 26eab4f78..43e678d13 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -516,13 +516,17 @@ Billing
 
     .. versionadded:: 2.0
 
+    .. versionchanged:: 2.1
+
+        The type of the ``query`` parameter was corrected from ``str`` to ``Mapping[str, str]``.
+
     :param payment_source_type: The payment source type.
     :type payment_source_type: :class:`PaymentSourceType`
-    :param path: The path of the callback.
+    :param path: The URL path of the callback.
     :type path: :class:`str`
-    :param query: The query of the callback.
-    :type query: :class:`str`
-    :param state: The state of the callback.
+    :param query: The URL query parameters of the callback.
+    :type query: Mapping[:class:`str`, :class:`str`]
+    :param state: A hash to verify the callback.
     :type state: :class:`str`
 
 Entitlements