diff --git a/tcms/issuetracker/base.py b/tcms/issuetracker/base.py
index 58ec605353..ac8eacb6a7 100644
--- a/tcms/issuetracker/base.py
+++ b/tcms/issuetracker/base.py
@@ -6,6 +6,7 @@
 
 RE_ENDS_IN_INT = re.compile(r"[\d]+$")
 
+
 def _function_from_path(fully_qualified_dotted_path):
     """
     Helper function which returns a callable object from a
@@ -235,4 +236,10 @@ def rpc_credentials(self):
 
         .. versionadded:: 12.6
         """
+        if settings.EXTERNAL_ISSUE_RPC_CREDENTIALS:
+            credentials_function = _function_from_path(
+                settings.EXTERNAL_ISSUE_RPC_CREDENTIALS
+            )
+            return credentials_function(self)
+
         return (self.bug_system.api_username, self.bug_system.api_password)
diff --git a/tcms/issuetracker/tests/redmine_post_processing.py b/tcms/issuetracker/tests/redmine_post_processing.py
index c2f2eac2f9..1b2460535c 100644
--- a/tcms/issuetracker/tests/redmine_post_processing.py
+++ b/tcms/issuetracker/tests/redmine_post_processing.py
@@ -20,3 +20,7 @@ def change_assignee(rpc, new_issue, execution, user):
     # Note: assignee needs to be a member of the project where issues are created
     # and needs to have a role with the `assignable` flag set to 1.
     rpc.issue.update(new_issue.id, assigned_to_id=atodorov.id)
+
+
+def rpc_credentials(issue_tracker):
+    return ("tester", "test-me")
diff --git a/tcms/issuetracker/tests/test_base.py b/tcms/issuetracker/tests/test_base.py
new file mode 100644
index 0000000000..2b9396fdbd
--- /dev/null
+++ b/tcms/issuetracker/tests/test_base.py
@@ -0,0 +1,45 @@
+# pylint: disable=attribute-defined-outside-init
+
+import os
+import unittest
+
+from django.test import override_settings
+
+from tcms.issuetracker.types import Redmine
+from tcms.rpc.tests.utils import APITestCase
+from tcms.testcases.models import BugSystem
+
+
+@unittest.skipUnless(
+    os.getenv("TEST_BUGTRACKER_INTEGRATION"),
+    "Bug tracker integration testing not enabled",
+)
+class TestBaseIntegration(APITestCase):
+    def _fixture_setup(self):
+        super()._fixture_setup()
+
+        bug_system = BugSystem.objects.create(  # nosec:B106:hardcoded_password_funcarg
+            name="Redmine at kiwitcms.atlassian.net",
+            tracker_type="tcms.issuetracker.types.Redmine",
+            base_url="http://bugtracker.kiwitcms.org:3000",
+            api_username="admin",
+            api_password="admin",
+        )
+        self.integration = Redmine(bug_system, None)
+
+    def test_non_overriden_credentials_are_returned(self):
+        (rpc_username, rpc_password) = self.integration.rpc_credentials
+
+        # not admin:admin as defined above
+        self.assertEqual(rpc_username, "admin")
+        self.assertEqual(rpc_password, "admin")
+
+    @override_settings(
+        EXTERNAL_ISSUE_RPC_CREDENTIALS="tcms.issuetracker.tests.redmine_post_processing.rpc_credentials"
+    )
+    def test_overriden_credentials_are_returned(self):
+        (rpc_username, rpc_password) = self.integration.rpc_credentials
+
+        # not admin:admin as defined above
+        self.assertEqual(rpc_username, "tester")
+        self.assertEqual(rpc_password, "test-me")
diff --git a/tcms/settings/common.py b/tcms/settings/common.py
index 24db02e788..558de77588 100644
--- a/tcms/settings/common.py
+++ b/tcms/settings/common.py
@@ -185,6 +185,10 @@
 # tcms.issuetracker.tests.redmine_post_processing for hints!
 EXTERNAL_ISSUE_POST_PROCESSORS = []
 
+# a fully qualified dotted path which overrides the implementation of
+# tcms.issutracker.base.IssueTrackerType.rpc_credentials
+EXTERNAL_ISSUE_RPC_CREDENTIALS = ""
+
 # Controls the default issue type for newly created issues in Jira.
 # See JIRA.get_issue_from_jira() method
 JIRA_ISSUE_TYPE = "Bug"