anchor.diff:  
     # Deletes an image from an artwork in my collection
     deleteArtworkImage(input: DeleteArtworkImageInput!): DeleteArtworkImagePayload
  +
  +  # Remove a bank account
  +  deleteBankAccount(input: DeleteBankAccountInput!): DeleteBankAccountPayload
   
     # Remove a credit card
     deleteCreditCard(input: DeleteCreditCardInput!): DeleteCreditCardPayload
  
positive.code:   # A list of authenticated external services
    authentications: [AuthenticationType!]!
  
    # Returns a single bidder position
    bidderPosition(id: String!): BidderPositionResult
  
  
negative.code: type DeleteArtworkImagePayload {
    artworkOrError: ArtworkMutationType
    clientMutationId: String
  }
  
  input DeleteBankAccountInput {
    clientMutationId: String
    id: String!
  }
  
  type DeleteBankAccountPayload {
    bankAccountOrError: BankAccountMutationType
    clientMutationId: String
    me: Me
  }
  
  input DeleteCreditCardInput {
  