diff --git a/package.json b/package.json
index 41d0126..5802e8b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@icpay/sdk",
-  "version": "1.3.41",
+  "version": "1.3.42",
   "description": "Official icpay SDK for Internet Computer payments",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/errors.ts b/src/errors.ts
index e48ce27..c685f1a 100644
--- a/src/errors.ts
+++ b/src/errors.ts
@@ -58,6 +58,8 @@ export const ICPAY_ERROR_CODES = {
 
   // Transaction errors
   TRANSACTION_HISTORY_FETCH_FAILED: 'TRANSACTION_HISTORY_FETCH_FAILED',
+  PAYMENT_HISTORY_FETCH_FAILED: 'PAYMENT_HISTORY_FETCH_FAILED',
+  PAYMENTS_BY_PRINCIPAL_FETCH_FAILED: 'PAYMENTS_BY_PRINCIPAL_FETCH_FAILED',
   SEND_FUNDS_USD_FAILED: 'SEND_FUNDS_USD_FAILED',
 
   // Ledger errors
diff --git a/src/index.ts b/src/index.ts
index 9d11273..27321bc 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,8 +11,9 @@ import {
   LedgerBalance,
   PriceCalculationRequest,
   PriceCalculationResult,
-  TransactionHistoryRequest,
-  TransactionHistoryResponse,
+  PaymentHistoryRequest,
+  PaymentHistoryResponse,
+  GetPaymentsByPrincipalRequest,
   LedgerInfo,
   SendFundsUsdRequest
 } from './types';
@@ -1059,10 +1060,10 @@ export class Icpay {
   }
 
   /**
-   * Get transaction history for the account (private method)
+   * Get payment history for account (requires secret key)
    */
-  async getTransactionHistory(request: TransactionHistoryRequest = {}): Promise<TransactionHistoryResponse> {
-    this.requireSecretKey('getTransactionHistory');
+  async getPaymentHistory(request: PaymentHistoryRequest = {}): Promise<PaymentHistoryResponse> {
+    this.requireSecretKey('getPaymentHistory');
     try {
       const params = new URLSearchParams();
 
@@ -1074,10 +1075,10 @@ export class Icpay {
       if (request.limit) params.append('limit', request.limit.toString());
       if (request.offset) params.append('offset', request.offset.toString());
 
-      const response = await this.privateApiClient!.get(`/sdk/transactions/history?${params.toString()}`);
+      const response = await this.privateApiClient!.get(`/sdk/payments/history?${params.toString()}`);
 
       return {
-        transactions: response.data.transactions.map((tx: any) => ({
+        payments: response.data.payments.map((tx: any) => ({
           id: tx.id,
           status: tx.status,
           amount: tx.amount,
@@ -1100,8 +1101,53 @@ export class Icpay {
       };
     } catch (error) {
       throw new IcpayError({
-        code: 'TRANSACTION_HISTORY_FETCH_FAILED',
-        message: 'Failed to fetch transaction history',
+        code: 'PAYMENT_HISTORY_FETCH_FAILED',
+        message: 'Failed to fetch payment history',
+        details: error
+      });
+    }
+  }
+
+  /**
+   * Get payments by principal ID (for connected wallet) - checks both sender_principal_id and expected_sender_principal
+   */
+  async getPaymentsByPrincipal(request: GetPaymentsByPrincipalRequest): Promise<PaymentHistoryResponse> {
+    this.requireSecretKey('getPaymentsByPrincipal');
+    try {
+      const params = new URLSearchParams();
+
+      if (request.limit) params.append('limit', request.limit.toString());
+      if (request.offset) params.append('offset', request.offset.toString());
+      if (request.status) params.append('status', request.status);
+
+      const response = await this.privateApiClient!.get(`/sdk/payments/by-principal/${request.principalId}?${params.toString()}`);
+
+      return {
+        payments: response.data.payments.map((tx: any) => ({
+          id: tx.id,
+          status: tx.status,
+          amount: tx.amount,
+          ledgerCanisterId: tx.ledgerCanisterId,
+          ledgerSymbol: tx.ledgerSymbol,
+          fromAddress: tx.fromAddress,
+          toAddress: tx.toAddress,
+          fee: tx.fee,
+          decimals: tx.decimals,
+          tokenPrice: tx.tokenPrice,
+          expectedSenderPrincipal: tx.expectedSenderPrincipal,
+          metadata: tx.metadata,
+          createdAt: new Date(tx.createdAt),
+          updatedAt: new Date(tx.updatedAt)
+        })),
+        total: response.data.total,
+        limit: response.data.limit,
+        offset: response.data.offset,
+        hasMore: response.data.hasMore
+      };
+    } catch (error) {
+      throw new IcpayError({
+        code: 'PAYMENTS_BY_PRINCIPAL_FETCH_FAILED',
+        message: 'Failed to fetch payments by principal',
         details: error
       });
     }
diff --git a/src/types/index.ts b/src/types/index.ts
index d120f24..b1096ea 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -191,7 +191,7 @@ export interface PriceCalculationResult {
   decimals: number;
 }
 
-export interface TransactionHistoryRequest {
+export interface PaymentHistoryRequest {
   accountId?: string;
   ledgerCanisterId?: string;
   fromTimestamp?: Date;
@@ -201,7 +201,7 @@ export interface TransactionHistoryRequest {
   offset?: number;
 }
 
-export interface TransactionHistoryItem {
+export interface PaymentHistoryItem {
   id: string;
   transactionId: number;
   status: 'pending' | 'completed' | 'failed';
@@ -221,14 +221,21 @@ export interface TransactionHistoryItem {
   updatedAt: Date;
 }
 
-export interface TransactionHistoryResponse {
-  transactions: TransactionHistoryItem[];
+export interface PaymentHistoryResponse {
+  payments: PaymentHistoryItem[];
   total: number;
   limit: number;
   offset: number;
   hasMore: boolean;
 }
 
+export interface GetPaymentsByPrincipalRequest {
+  principalId: string;
+  limit?: number;
+  offset?: number;
+  status?: 'pending' | 'completed' | 'failed';
+}
+
 export interface LedgerInfo {
   id: string;
   name: string;