When requesting API
https://api.smsketchuployalty.com.ua/rest/viber/create with parameters {"validity":86400,"messages":[{"to":[{"msisdn":"0633761858"} ],"text":"test","alpha_name":"Sport Life"}]} gets response {"error":6,"errorDescription":"Invalid price grid parameter"}
Additional headers are sent
X-API-KEY: [key here from your integration]
X-API-SOURCE: BSG PHP Library
Content-Type: application/json
There is no information about this error in the documentation provided in the specified revision - I recommend that you check it with the technical support of the service.