To receive a voucher in the desired language, when creating the booking API, you need to pass in the variable “lang” a short designation of this language. In response to the API, you will receive 6 types of vouchers with content completely in the requested language (in this case, in French): API vouchers are available in 14 languages: English (en) German (de) Spanish (es) French (fr) Italian (it) Chinese (cn) Dutch (nl) Polish (pl) Hindi (in) Indonesian (id) Kazakh (kz) Ukrainian (ua) Turkish (tr) Russian (ru)