diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/node/NodeBase.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/node/NodeBase.java
index 872a434..ede1db0 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/node/NodeBase.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/node/NodeBase.java
@@ -6,24 +6,30 @@ import cz.cvut.fel.sit.omo.foodchain.product.Product;
 import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
 import cz.cvut.fel.sit.omo.foodchain.requirement.Requirement;
 import cz.cvut.fel.sit.omo.foodchain.signature.Signature;
+import cz.cvut.fel.sit.omo.foodchain.signature.SignatureManager;
+import cz.cvut.fel.sit.omo.foodchain.util.ChannelObserver;
 
 import javax.money.MonetaryAmount;
 import java.util.LinkedList;
 import java.util.List;
 
 
-public class NodeBase {
+public class NodeBase implements ChannelObserver {
     private final List<ChannelBase> subscribedChannels;
     private final List<Product> products;
+    private MonetaryAmount money;
 
-    public NodeBase(){
+    private final List<Transaction> refusedTranslations;
+
+    public NodeBase() {
         subscribedChannels = new LinkedList<>();
         products = new LinkedList<>();
+        refusedTranslations = new LinkedList<>();
     }
 
 
     public void sendTransaction(Product product, NodeBase node) {
-        Transaction transaction = new ProductTransaction(this, node, TransactionType.SALE, product); //TODO wrong constructor
+        Transaction transaction = new ProductTransaction(this, node, TransactionType.SALE, product);
 
         subscribedChannels.stream()
                 .filter(ch -> ch.getProductType().equals(product.getProductType()))
@@ -31,8 +37,12 @@ public class NodeBase {
     }
 
 
-    public void sendTransaction(MonetaryAmount amount, NodeBase node) {
+    public void sendTransaction(MonetaryAmount amount, NodeBase node, ProductTransaction prevTransaction) {
+        Transaction transaction = new FinancialTransaction(this, node, TransactionType.PURCHASE, amount, prevTransaction);
 
+        subscribedChannels.stream()
+                .filter(ch -> ch.getProductType().equals(prevTransaction.getProduct().getProductType()))
+                .findAny().ifPresent(channel -> channel.addTransaction(transaction));
     }
 
 
@@ -46,26 +56,18 @@ public class NodeBase {
     }
 
 
-    public void refuseTransaction(ProductTransaction transaction) {
-
+    public void refuseTransaction(Transaction transaction) {
+        transaction.endTransaction();
+        refusedTranslations.add(transaction); //TODO maybe need more work on it
     }
 
-
-    public void refuseTransaction(FinancialTransaction transaction) {
-
-    }
-
-    //TODO another way to read transaction
-
     public Transaction readNextTransaction(ChannelBase channel) {
+
+
         return channel.getNextTransaction();
     }
 
 
-    public Requirement readNextRequirement(ChannelBase channel) {
-        return channel.getNextRequirement();
-    }
-
 
     public void acceptRequirement(Requirement requirement) {
 
@@ -83,7 +85,7 @@ public class NodeBase {
 
 
     public void doAction(ProductOperationType action, Product product) {
-        //create new action
+        Action actionProcess = new Action(this, product);
     }
 
 
@@ -93,26 +95,32 @@ public class NodeBase {
 
 
     public void storeProduct(Product product) {
-
+        this.products.add(product);
     }
 
 
     public void storeProducts(List<Product> products) {
-
+        this.products.addAll(products);
     }
 
 
     public Product getProductFromStorage(String name, ProductType type) {
-        return null;
+        return products.stream().filter(ch -> ch.getProductType() == type && ch.getName().equals(name)).findFirst().orElse(null);
     }
 
 
     public Signature generateSignature(Transaction transaction) {
-        return null;
+        return SignatureManager.signTransaction(transaction);
     }
 
 
-    public boolean validateSignature(Signature signature) {
-        return false;
+    public boolean validateSignature(Transaction transaction) {
+        return SignatureManager.validateSignature(transaction);
+    }
+
+    @Override
+    public void update(Requirement requirement) {
+        if (!requirement.getCreator().equals(this))
+            acceptRequirement(requirement);
     }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java
index d498393..a2a9128 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java
@@ -9,7 +9,7 @@ public class FinancialTransaction extends Transaction {
     private final MonetaryAmount amount;
     private final ProductTransaction transactionPaid;
 
-    FinancialTransaction(NodeBase creator, NodeBase receiver, TransactionType type, MonetaryAmount amount, ProductTransaction transactionPaid) {
+    public FinancialTransaction(NodeBase creator, NodeBase receiver, TransactionType type, MonetaryAmount amount, ProductTransaction transactionPaid) {
         super(creator, receiver, type);
         this.amount = amount;
         this.transactionPaid = transactionPaid;