This conforms to the regular HTTP specification for language but if the supplier has translated their content it will return the content in the specified language if possible. Also all error messages will be translated. eg.
This header will mark any booking you perform with live credentials as a test sale. This will mean it will not consume any availability, the barcodes will not work, and you will not be invoiced for it. e.g.
This must be
A list of the capabilities that were initialised with this request.
This is the ISO 3166 alpha-2 country code we determined for the requesting IP address. This could be useful if your integration is client-side only. e.g.
This is the ISO 4217 currency code we determined for the requesting IP's country. This could be useful if your integration is client-side only. e.g.
This will return
This request ID is auto-generated and can be used to help debug issues.
This is the language of the content being returned. See the Localization section for info how to set it.