SAVON setting envelope namespace in the envelope

i'm trying to add a namespace in my envelop for xmlns:api= and set the url as example:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:api="http://api.notes.xyz.com/">

not having much success in finding examples. Is this possible?

What I have done in the past was the following (I always preferred to go without WSDL). Perhaps you can use it:

#!/usr/bin/env ruby

require 'savon'

additional_ns = {
 'xmlns:api' => "http://api.notes.xyz.com/"
}

client = Savon.client(
    :endpoint => "http://www.example.com/endpoint",
    :namespace => "xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/",
    :namespaces => additional_ns,
    :log => true,
    :log_level => :debug,
    :pretty_print_xml => true,
    :ssl_verify_mode => :none
)

client.call(....)