Merge pull request #860 from drocek/bugfix/BATM-4385_six_decimal_plac…

…es_for_usdt_on_binance

BATM-4385: six decimal places for USDT on Binance exchange

server_extensions_extra/src/main/java/com/generalbytes/batm/server/extensions/extra/bitcoin/exchanges/binance/BinanceExchange.java

@@ -17,13 +17,15 @@
  ************************************************************************************/
 package com.generalbytes.batm.server.extensions.extra.bitcoin.exchanges.binance;
 
+import com.generalbytes.batm.common.currencies.CryptoCurrency;
 import com.generalbytes.batm.server.extensions.extra.bitcoin.exchanges.XChangeExchange;
 import org.knowm.xchange.ExchangeSpecification;
 import org.knowm.xchange.currency.CurrencyPair;
 import org.knowm.xchange.dto.account.AccountInfo;
 import org.knowm.xchange.dto.account.Wallet;
 
 import java.math.BigDecimal;
+import java.math.RoundingMode;
 import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -91,6 +93,11 @@ protected BigDecimal getAmountRoundedToMinStep(BigDecimal cryptoAmount, BigDecim
     public String sendCoins(String destinationAddress, BigDecimal amount, String cryptoCurrency, String description) {
         BigDecimal withdrawalFee = getWithdrawalFee(cryptoCurrency);
         amount = amount.add(withdrawalFee);
+
+        if (CryptoCurrency.USDT.getCode().equals(cryptoCurrency)) {
+            amount = amount.setScale(6, RoundingMode.FLOOR);
+        }
+
         return super.sendCoins(destinationAddress, amount, cryptoCurrency, description);
     }
 
@@ -110,8 +117,8 @@ protected BigDecimal getWithdrawalMinStep(String cryptoCurrency) {
     }
 
     protected static class SupportedCryptoCurrency {
-        private String cryptoCurrency;
-        private BigDecimal withdrawalMinStep;
+        private final String cryptoCurrency;
+        private final BigDecimal withdrawalMinStep;
 
         public SupportedCryptoCurrency(String cryptoCurrency) {
             this(cryptoCurrency, new BigDecimal("0.00000001"));