In your providers config json file you must include a Vultr personal access token:
{
"vultr":{
"token": "your-vultr-personal-access-token"
}
}
This provider does not recognize any special metadata fields unique to Vultr.
Example javascript:
var VULTR = NewDnsProvider("vultr", "VULTR");
D("example.tld", REG_DNSIMPLE, DnsProvider(VULTR),
A("test","1.2.3.4")
);
Vultr depends on a Vultr personal access token.