Changes to PATCH /v2/customers/:merchant_id

added the optional property error/code to the response with the 401 status

added the optional property error/code to the response with the 403 status

added points spend orders discriminator mapping keys to the customer/tier_eligibility/anyOf[subschema #1] response property for the response status 200

added the required property customer/loyalty_pass_installed to the response with the 200 status