anchor.diff:  
     # True if message is an invoice message
     isInvoice: Boolean
  +    @deprecated(
  +      reason: "Payment Request was deprecated. The field was kept for legacy client support. [Will be removed in v2]"
  +    )
   }
   
   # A connection to a list of items.
  
positive.code: type Invoice implements Node {
    # A globally unique ID.
    id: ID!
  
    # A type-specific ID likely used as a database ID.
    internalID: ID!
  
    # Lewitt's invoice id.
    lewittInvoiceID: String!
  
    # Link to public checkout page.
    paymentURL: String
  
    # Current state of invoice.
    state: InvoiceState
  
    # A formatted price with various currency formatting options.
    total(
  
negative.code:     symbol: String
      thousand: String = ","
    ): String
      @deprecated(
        reason: "Payment Request was deprecated. The type was kept for legacy client support. [Will be removed in v2]"
      )
  }
  
  enum InvoiceState {
  