Reference
CART_CUSTOMER_MISMATCH
Cart belongs to another customer
Cart belongs to another customer
HTTP status 409 Conflict, code CART_CUSTOMER_MISMATCH.
What it means#
You asked to attach the signed-in customer to a cart that is already linked to a different customer. The cart is left exactly as it was.
What to do#
Start a new cart for this customer; a cart is never moved from one customer to another.
On the wire#
Every error response carrying this code names this page in error.moreInfo,
with the request id in the query string. See Error codes for
the response shape and the list of every code.