docs: function generateTransactionRequest(signer, transaction, options) {
    let iou = {
      amt: transaction.amount,
      cur: transaction.currency,
      sub: signer.address,
      aud: transaction.destination,
      nce: String(Math.floor(Math.random() * 1000000000))
    };
  
    return createTransactionRequestStatement(signer, iou, options);
  }