API access credentials should be stored as an environment variables
MESSENTE_API_USERNAME=your_api_key
MESSENTE_API_PASSWORD=your_api_secret
resp, err := pricing.Listing("countryCode") // pricing.Response, error
balance, err := balance.Get() // float64, error
lookup, err := lookup.Lookup([]string{
"+371123456789",
}) // lookup.Response, error
sentSms, err := sms.Send(&sms.Options{
ReceiverNumber: "+372123456789",
SenderName: "SenderNameHere",
Text: "Your SMS content here",
}) // string, error