feat(core): update buy instruction, add volume_accumulator accounts

src/core/pubkeys.py

@@ -49,3 +49,34 @@ class PumpAddresses:
     LIQUIDITY_MIGRATOR: Final[Pubkey] = Pubkey.from_string(
         "39azUYFWPz3VHgKCf3VChUwbpURdCHRxjWVowf5jUJjg"
     )
+
+    @staticmethod
+    def find_global_volume_accumulator() -> Pubkey:
+        """
+        Derive the Program Derived Address (PDA) for the global volume accumulator.
+        
+        Returns:
+            Pubkey of the derived global volume accumulator account
+        """
+        derived_address, _ = Pubkey.find_program_address(
+            [b"global_volume_accumulator"],
+            PumpAddresses.PROGRAM,
+        )
+        return derived_address
+
+    @staticmethod
+    def find_user_volume_accumulator(user: Pubkey) -> Pubkey:
+        """
+        Derive the Program Derived Address (PDA) for a user's volume accumulator.
+        
+        Args:
+            user: Pubkey of the user account
+            
+        Returns:
+            Pubkey of the derived user volume accumulator account
+        """
+        derived_address, _ = Pubkey.find_program_address(
+            [b"user_volume_accumulator", bytes(user)],
+            PumpAddresses.PROGRAM,
+        )
+        return derived_address