add generate address functionality

index.ts

@@ -5,6 +5,7 @@ import initBreez, {
   type InputType,
   type LogEntry,
   type Payment,
+  type PaymentMethod,
   type PreparePayOnchainRequest,
   type PrepareReceiveRequest,
   type PrepareSendRequest,
@@ -495,4 +496,34 @@ export default class PortalBtcWallet {
       );
     }
   }
+
+  /**
+   * Generates a new address for a payment method
+   *
+   * @param paymentMethod - The payment method to generate an address for
+   * @returns Promise<string> - The new address
+   */
+  async generateAddress(paymentMethod: PaymentMethod) {
+    if (!this.breezSDK) throw new Error("Breez SDK not initialized");
+    const prep = await this.breezSDK.prepareReceivePayment({ paymentMethod });
+    const res = await this.breezSDK.receivePayment({ prepareResponse: prep });
+    const rawDestination = res.destination;
+
+    if (rawDestination === undefined) {
+      throw new Error("Failed to generate address: destination is undefined.");
+    }
+
+    let destination = rawDestination;
+
+    const colonIndex = destination.indexOf(":");
+    if (colonIndex !== -1) {
+      destination = destination.substring(colonIndex + 1);
+    }
+
+    const questionMarkIndex = destination.indexOf("?");
+    if (questionMarkIndex !== -1) {
+      destination = destination.substring(0, questionMarkIndex);
+    }
+    return destination;
+  }
 }