Dnsimple.Contacts.list_contacts

You're seeing just the function list_contacts, go back to Dnsimple.Contacts module for more information.
Link to this function

list_contacts(client, account_id, options \\ [])

Lists the contacts in an account.

See:

Examples:

client = %Dnsimple.Client{access_token: "a1b2c3d4"}
{:ok, response} = Dnsimple.Contacts.list_contacts(client, account_id = "1010")
{:ok, response} = Dnsimple.Contacts.list_contacts(client, account_id = "1010", sort: "email:desc")