anchor.diff:    from: OrderPartyUnion!
     fromParticipant: OrderParticipantEnum
     id: ID!
  +  note: String
     order: Order!
     respondsTo: Offer
     shippingTotalCents: Int
  
positive.code: 
    # A unique identifier for the client performing the mutation.
    clientMutationId: String
    offerId: ID!
  }
  
  
negative.code:   setPayment(input: SetPaymentInput!): SetPaymentPayload
    setShipping(input: SetShippingInput!): SetShippingPayload
    submitOrder(input: SubmitOrderInput!): SubmitOrderPayload
    submitOrderWithOffer(input: SubmitOrderWithOfferInput!): SubmitOrderWithOfferPayload
    submitPendingOffer(input: SubmitPendingOfferInput!): SubmitPendingOfferPayload
  }
  
  