payment = %CreditCard{
  number: "4111111111111111",
  month: 11,
  year: 2018,
  first_name: "Longbob",
  last_name: "Longsen",
  verification_code: "123",
  brand: "visa"
}
credit_card = %CreditCard{
  number: "4242424242424242",
  month: 11,
  year: 2018,
  first_name: "Longbob",
  last_name: "Longsen",
  verification_code: "123",
  brand: "visa"
}
address = %{
  name:     "Jim Smith",
  address1: "456 My Street",
  address2: "Apt 1",
  company:  "Widgets Inc",
  city:     "Ottawa",
  state:    "ON",
  zip:      "K1C2N6",
  country:  "CA",
  phone:    "(555)555-5555",
  fax:      "(555)555-6666"
}
options = [
  config: %{
            username: "testintegrationc",
            password: "password9"
          },
  order_id: 1,
  billing_address: address,
  description: "Store Purchase",
]

Validates the config dynamically depending on what is the value of required_config