diff --git a/src/IPurchaseTracker.sol b/src/IPurchaseTracker.sol
index 5de77af..9ec6929 100644
--- a/src/IPurchaseTracker.sol
+++ b/src/IPurchaseTracker.sol
@@ -3,4 +3,8 @@ pragma solidity ^0.8.20;
 
 interface IPurchaseTracker {
     function recordPurchase(bytes32 paymentId, address seller, address buyer, uint256 amount) external;
+    function getPurchaseCount(address recipient) external view returns (uint256);
+    function getPurchaseAmount(address recipient) external view returns (uint256);
+    function getSalesCount(address recipient) external view returns (uint256);
+    function getSalesAmount(address recipient) external view returns (uint256);
 }