diff --git a/changelog.d/6689.misc b/changelog.d/6689.misc
new file mode 100644
index 0000000000..17f15e73a8
--- /dev/null
+++ b/changelog.d/6689.misc
@@ -0,0 +1 @@
+Updates to the SAML mapping provider API.
diff --git a/synapse/handlers/saml_handler.py b/synapse/handlers/saml_handler.py
index 0082f85c26..107f97032b 100644
--- a/synapse/handlers/saml_handler.py
+++ b/synapse/handlers/saml_handler.py
@@ -24,6 +24,7 @@ from saml2.client import Saml2Client
 from synapse.api.errors import SynapseError
 from synapse.config import ConfigError
 from synapse.http.servlet import parse_string
+from synapse.module_api import ModuleApi
 from synapse.rest.client.v1.login import SSOAuthHandler
 from synapse.types import (
     UserID,
@@ -59,7 +60,8 @@ class SamlHandler:
 
         # plugin to do custom mapping from saml response to mxid
         self._user_mapping_provider = hs.config.saml2_user_mapping_provider_class(
-            hs.config.saml2_user_mapping_provider_config
+            hs.config.saml2_user_mapping_provider_config,
+            ModuleApi(hs, hs.get_auth_handler()),
         )
 
         # identifier for the external_ids table
@@ -112,10 +114,10 @@ class SamlHandler:
         # the dict.
         self.expire_sessions()
 
-        user_id = await self._map_saml_response_to_user(resp_bytes)
+        user_id = await self._map_saml_response_to_user(resp_bytes, relay_state)
         self._sso_auth_handler.complete_sso_login(user_id, request, relay_state)
 
-    async def _map_saml_response_to_user(self, resp_bytes):
+    async def _map_saml_response_to_user(self, resp_bytes, client_redirect_url):
         try:
             saml2_auth = self._saml_client.parse_authn_request_response(
                 resp_bytes,
@@ -183,7 +185,7 @@ class SamlHandler:
             # Map saml response to user attributes using the configured mapping provider
             for i in range(1000):
                 attribute_dict = self._user_mapping_provider.saml_response_to_user_attributes(
-                    saml2_auth, i
+                    saml2_auth, i, client_redirect_url=client_redirect_url,
                 )
 
                 logger.debug(
@@ -216,6 +218,8 @@ class SamlHandler:
                     500, "Unable to generate a Matrix ID from the SAML response"
                 )
 
+            logger.info("Mapped SAML user to local part %s", localpart)
+
             registered_user_id = await self._registration_handler.register_user(
                 localpart=localpart, default_display_name=displayname
             )
@@ -265,17 +269,21 @@ class SamlConfig(object):
 class DefaultSamlMappingProvider(object):
     __version__ = "0.0.1"
 
-    def __init__(self, parsed_config: SamlConfig):
+    def __init__(self, parsed_config: SamlConfig, module_api: ModuleApi):
         """The default SAML user mapping provider
 
         Args:
             parsed_config: Module configuration
+            module_api: module api proxy
         """
         self._mxid_source_attribute = parsed_config.mxid_source_attribute
         self._mxid_mapper = parsed_config.mxid_mapper
 
     def saml_response_to_user_attributes(
-        self, saml_response: saml2.response.AuthnResponse, failures: int = 0,
+        self,
+        saml_response: saml2.response.AuthnResponse,
+        failures: int,
+        client_redirect_url: str,
     ) -> dict:
         """Maps some text from a SAML response to attributes of a new user
 
@@ -285,6 +293,8 @@ class DefaultSamlMappingProvider(object):
             failures: How many times a call to this function with this
                 saml_response has resulted in a failure
 
+            client_redirect_url: where the client wants to redirect to
+
         Returns:
             dict: A dict containing new user attributes. Possible keys:
                 * mxid_localpart (str): Required. The localpart of the user's mxid