Pedido de implementação de metodo about nubank-api HOT 2 OPEN

public async get_pix_identifier(
    txId: any
  ): Promise<PixPaymentRequest> {
    const getPixInfo = {
      type: "TRANSFER_IN",
      id: txId
    };

    const { data: get_pix_info } = await this._context.http.graphql(
      GqlOperations.MUTATION_GET_PIX_TXID,
      getPixInfo 
    );
    console.log(get_pix_info) // Retorno: { viewer: { savingsAccount: null } }
    return get_pix_info?.viewer?.savingsAccount?.getGenericReceiptScreen?.screenPieces;
  }

export const MUTATION_GET_PIX_TXID: string = `
query get_generic_receipt_screen($type: String!, $id: ID!) {
  viewer {
    savingsAccount {
      getGenericReceiptScreen(type: $type, id: $id) {
        screenShowShareAction
        screenType
        screenPieces {
          __typename
          fallbackMessage
          ... on ReceiptHeaderPiece {
            headerTitle
            headerSubtitle
          }
          ... on ReceiptMessagePiece {
            messageTitle
            messageContent
          }
          ... on ReceiptFooterPiece {
            footerTitle
            footerContent
          }
          ... on ReceiptTablePiece {
            tableHeader {
              icon
              title
              subtitle
              deeplinkWithMeta {
                href
                analytics {
                  key
                  value
                }
              }
            }
            tableItems {
              label
              value
            }
          }
        }
      }
    }
  }
}
`;