OpenIntegrations/docs/en/examples/GreenAPI/ClearMessageQueue.txt

    ApiUrl           = FunctionParameters["GreenAPI_ApiURL"];
    MediaUrl         = FunctionParameters["GreenAPI_MediaURL"];
    IdInstance       = FunctionParameters["GreenAPI_IdInstance"];
    ApiTokenInstance = FunctionParameters["GreenAPI_Token"];

    AccessParameters = OPI_GreenAPI.FormAccessParameters(ApiUrl, MediaUrl, IdInstance, ApiTokenInstance);
    Result           = OPI_GreenAPI.ClearMessageQueue(AccessParameters);