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# Mexico Billing Market and Service Key VXC Fix

**Mexico Billing Market** – Four new mandatory TAX Registration fields related to fiscal and legal compliance information are now required when adding or editing the Mexico billing market. These are: Company Type, Tax Regime, Tax Purpose, and RFC Number. For more information, see [POST Set Billing Market](/api-reference).

**Fixed** – B-End VLAN being overridden by the A-End VLAN in the Service Key VXCs `/validate` and `/buy` endpoints. After ordering a Service Key VXC from a Port, MCR or MVE with a defined B-End VLAN, the service returned a different VLAN value from the one sent as part of the payload in both the `/validate` and `/buy` APIs. The B-End value the API returned for Service Key VXCs was the VLAN value in the A-End. Now the B-End VLAN value is returned correctly.