feat: Transform custom_fee_fixed example to end-to-end test

CHANGELOG.md

@@ -73,6 +73,8 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 - Rename test files across the repository to ensure they consistently end with _test.py (#1055)
 - Cleaned up `token_airdrop_claim_signature_required` example for pylint compliance (no functional changes). (#1080)
 - Rename the file 'test_token_fee_schedule_update_transaction_e2e.py' to make it ends with _test.py as all other test files.(#1117)
+- Format token examples with Black for consistent code style and improved readability (#1119)
+- Transformed `examples/tokens/custom_fee_fixed.py` to be an end-to-end example, that interacts with the Hedera network, rather than a static object demo.
 - Format token examples with Black for consistent code style and improved readability (#1119) 
 - Replaced `ResponseCode.get_name(receipt.status)` with the  `ResponseCode(receipt.status).name` across examples and integration tests for consistency. (#1136)
 

examples/tokens/custom_fee_fixed.py

@@ -4,26 +4,119 @@
 python examples/tokens/custom_fixed_fee.py
 """
 
-from hiero_sdk_python.tokens.custom_fixed_fee import CustomFixedFee
+import os
+import sys
+from dotenv import load_dotenv
+
+from hiero_sdk_python.client.network import Network
+from hiero_sdk_python.crypto.private_key import PrivateKey
+from hiero_sdk_python.client.client import Client
+from hiero_sdk_python.query.token_info_query import TokenInfoQuery
 from hiero_sdk_python.account.account_id import AccountId
-from hiero_sdk_python.tokens.token_id import TokenId
+from hiero_sdk_python.response_code import ResponseCode
+from hiero_sdk_python.tokens.supply_type import SupplyType
+from hiero_sdk_python.tokens.custom_fixed_fee import CustomFixedFee
+from hiero_sdk_python.hbar import Hbar
+from hiero_sdk_python.tokens.token_create_transaction import TokenCreateTransaction
+from hiero_sdk_python.tokens.token_type import TokenType
+
+
+load_dotenv()
+network_name = os.getenv("NETWORK", "testnet").lower()
+
+def setup_client():
+    """Initialize and set up the client with operator account"""
+    # Initialize network and client
+    network = Network(network_name)
+    print(f"Connecting to Hedera {network_name} network!")
+    client = Client(network)
+
+    # This disables the SSL error in the local development environment (Keep commented for production) #
+
+    # client.set_transport_security(False)
+    # client.set_verify_certificates(False)
+
+    try:
+        operator_id_str = os.getenv('OPERATOR_ID')
+        operator_key_str = os.getenv('OPERATOR_KEY')
+
+        if not operator_id_str or not operator_key_str:
+            raise ValueError("Environment variables OPERATOR_ID or OPERATOR_KEY are missing.")
+
+        operator_id = AccountId.from_string(operator_id_str)
+        operator_key = PrivateKey.from_string(operator_key_str)
+
+        client.set_operator(operator_id, operator_key)
+        print(f"Client set up with operator id {client.operator_account_id}")
+        return client, operator_id, operator_key
+
+    except (TypeError, ValueError) as e:
+        print(f"Error: {e}")
+        print("Please check OPERATOR_ID and OPERATOR_KEY in your .env file.")
+        sys.exit(1)
 
+def custom_fixed_fee_example():
+    """
+
+    Demonstrates how to create a token with a Custom Fixed Fee.
+
+    """
+
+    client, operator_id, operator_key = setup_client()
+
+    print("\n--- Creating Custom Fixed Fee ---")
 
-def custom_fixed_fee():
     fixed_fee = CustomFixedFee(
-        amount=100,
-        denominating_token_id=TokenId(0, 0, 123),
-        fee_collector_account_id=AccountId(0, 0, 456),
-        all_collectors_are_exempt=False,
+        amount=Hbar(1).to_tinybars(), 
+        fee_collector_account_id=operator_id,
+        all_collectors_are_exempt=False
     )
-    print("\n--- Custom Fixed Fee ---")
-    print(fixed_fee)
 
-    # Convert to protobuf
-    fixed_fee_proto = fixed_fee._to_proto()
+    print(f"Fee Definition: Pay 1 HBAR to {operator_id}")
+
+    print("\n--- Creating Token with Fee ---")
+    transaction = (
+        TokenCreateTransaction()
+        .set_token_name("Fixed Fee Example Token")
+        .set_token_symbol("FFET")
+        .set_decimals(2)
+        .set_treasury_account_id(operator_id)
+        .set_token_type(TokenType.FUNGIBLE_COMMON)
+        .set_supply_type(SupplyType.INFINITE)
+        .set_initial_supply(1000)
+        .set_admin_key(operator_key)
+        .set_custom_fees([fixed_fee]) 
+        .freeze_with(client)
+        .sign(operator_key)
+    )
+
+    try:
+        receipt = transaction.execute(client)
+
+        # Check if the status is explicitly SUCCESS
+        if receipt.status != ResponseCode.SUCCESS:
+            print(f"Transaction failed with status: {ResponseCode(receipt.status).name}")
+
+        token_id = receipt.token_id
+        print(f"Token created successfully with ID: {token_id}")
+
+        print("\n--- Verifying Fee on Network ---")
+        token_info = TokenInfoQuery().set_token_id(token_id).execute(client)
 
-    print("Fixed Fee Protobuf:", fixed_fee_proto)
+        retrieved_fees = token_info.custom_fees
+        if retrieved_fees:
+            print(f"Success! Found {len(retrieved_fees)} custom fee(s) on token.")
+            for fee in retrieved_fees:
+                print(f"Fee Collector: {fee.fee_collector_account_id}")
+                print(f"Fee Details: {fee}")
+        else:
+            print("Error: No custom fees found on the token.")
 
+    except Exception as e:
+        print(f"Transaction failed: {e}")
+        sys.exit(1)
+    finally:
+        client.close()
 
 if __name__ == "__main__":
-    custom_fixed_fee()
+    custom_fixed_fee_example()