diff --git a/tailbone/webapi.py b/tailbone/webapi.py
index b623bd70..a437f0c3 100644
--- a/tailbone/webapi.py
+++ b/tailbone/webapi.py
@@ -32,6 +32,7 @@ from pyramid.authentication import SessionAuthenticationPolicy
 
 from tailbone import app
 from tailbone.auth import TailboneAuthorizationPolicy
+from tailbone.providers import get_all_providers
 
 
 def make_rattail_config(settings):
@@ -46,6 +47,7 @@ def make_pyramid_config(settings):
     """
     Make a Pyramid config object from the given settings.
     """
+    rattail_config = settings['rattail_config']
     pyramid_config = Configurator(settings=settings, root_factory=app.Root)
 
     # configure user authorization / authentication
@@ -77,6 +79,13 @@ def make_pyramid_config(settings):
     else:
         pyramid_config.include('pyramid_retry')
 
+    # fetch all tailbone providers
+    providers = get_all_providers(rattail_config)
+    for provider in providers.values():
+
+        # configure DB sessions associated with transaction manager
+        provider.configure_db_sessions(rattail_config, pyramid_config)
+
     # add some permissions magic
     pyramid_config.add_directive('add_tailbone_permission_group', 'tailbone.auth.add_permission_group')
     pyramid_config.add_directive('add_tailbone_permission', 'tailbone.auth.add_permission')