anchor.diff:  }
   
   union BankAccountMutationType = BankAccountMutationFailure | BankAccountMutationSuccess
  +
  +enum BankAccountTypes {
  +  SEPA_DEBIT
  +  US_BANK_ACCOUNT
  +}
   
   type Bidder implements Node {
     createdAt(
  
positive.code:   authentications: [AuthenticationType!]!
  
    # A list of the current user's bank accounts
    bankAccounts(after: String, before: String, first: Int, last: Int): BankAccountConnection
  
    # Returns a single bidder position
    bidderPosition(id: String!): BidderPositionResult
  
negative.code: 
    # Last four characters of the account identifier
    last4: String!
  
    # Bank account type
    type: BankAccountTypes!
  }
  
  # A connection to a list of items.
  