Changes to Add a Shippo carrier account

added the new optional header request parameter SHIPPO-ACCOUNT-ID

added UPSConnectExistingOwnAccountStreamlinedParameters to the allOf[#/components/schemas/CarrierAccountBase]/parameters response property oneOf list for the response status 201

for the header request parameter SHIPPO-API-VERSION, default value 2018-02-08 was added

removed the true enum value from the allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/use_multi_factor_registration response property for the response status 201

removed CarrierAccountSendleCreateRequest from the request body oneOf list

added royal_mail royal_mail_sf mapping keys to the request discriminator

removed sendle mapping keys from the request discriminator

added CarrierAccountRoyalMailCreateRequest CarrierAccountRoyalMailSfCreateRequest to the request body oneOf list

added the optional property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/verification_invoice_amount to the response with the 201 status

added the optional property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/verification_invoice_currency to the response with the 201 status

added the optional property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/verification_invoice_date to the response with the 201 status

added the optional property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/verification_invoice_number to the response with the 201 status

added the optional property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/verification_pin to the response with the 201 status

added the required property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/use_multi_factor_registration to the response with the 201 status

added the required property allOf[#/components/schemas/CarrierAccountBase]/parameters/oneOf[subschema #2: FedEx account parameters]/verification_option to the response with the 201 status

the carrier request property const value canada_post was added

the carrier request property const value chronopost was added

the carrier request property const value colissimo was added

the carrier request property const value correos was added

the carrier request property const value deutsche_post was added

the carrier request property const value dhl_express was added

the carrier request property const value dpd_de was added

the carrier request property const value dpd_uk was added

the carrier request property const value fedex was added

the carrier request property const value hermes_uk was added

the carrier request property const value mondial_relay was added

the carrier request property const value poste_italiane was added

the carrier request property const value sendle was added

the carrier request property const value ups was added

the carrier request property const value usps was added

added request discriminator