diff --git a/src/domains/checkout-app/api/checkout/checkout_carts_auth/v1/_base_policy.xml.tpl b/src/domains/checkout-app/api/checkout/checkout_carts_auth/v1/_base_policy.xml.tpl
index 81152120a7..259d99a473 100644
--- a/src/domains/checkout-app/api/checkout/checkout_carts_auth/v1/_base_policy.xml.tpl
+++ b/src/domains/checkout-app/api/checkout/checkout_carts_auth/v1/_base_policy.xml.tpl
@@ -11,6 +11,11 @@
                   <value>WISP_REDIRECT</value>
               </set-header>
           </when>
+          <otherwise>
+              <set-header name="x-client-id" exists-action="override">
+                  <value>CHECKOUT_CART</value>
+              </set-header>
+          </otherwise>
           <!-- add here handling for future api clients to be integrated, such as SEND -->
       </choose>
   </inbound>