feat(transactions): add full pagination support with older_id and custom count parameters

ts/bunq.classes.monetaryaccount.ts

@@ -111,18 +111,41 @@ export class BunqMonetaryAccount {
 
   /**
    * gets all transactions on this account
+   * @param options - Pagination options or a number for backward compatibility (treated as newer_id)
    */
-  public async getTransactions(startingIdArg: number | false = false): Promise<BunqTransaction[]> {
-    const paginationOptions: IBunqPaginationOptions = {
-      count: 200,
-      newer_id: startingIdArg,
+  public async getTransactions(options?: IBunqPaginationOptions | number | false): Promise<BunqTransaction[]> {
+    let paginationOptions: IBunqPaginationOptions = {};
+    
+    // Backward compatibility: if a number or false is passed, treat it as newer_id
+    if (typeof options === 'number' || options === false) {
+      paginationOptions.newer_id = options;
+    } else if (options) {
+      paginationOptions = { ...options };
+    }
+    
+    // Set default count if not specified
+    if (!paginationOptions.count) {
+      paginationOptions.count = 200;
+    }
+    
+    // Build clean pagination object - only include properties that are not false/undefined
+    const cleanPaginationOptions: IBunqPaginationOptions = {
+      count: paginationOptions.count,
     };
+    
+    if (paginationOptions.newer_id !== undefined && paginationOptions.newer_id !== false) {
+      cleanPaginationOptions.newer_id = paginationOptions.newer_id;
+    }
+    
+    if (paginationOptions.older_id !== undefined && paginationOptions.older_id !== false) {
+      cleanPaginationOptions.older_id = paginationOptions.older_id;
+    }
 
     await this.bunqAccountRef.apiContext.ensureValidSession();
     
     const response = await this.bunqAccountRef.getHttpClient().list(
       `/v1/user/${this.bunqAccountRef.userId}/monetary-account/${this.id}/payment`,
-      paginationOptions
+      cleanPaginationOptions
     );
 
     const transactionsArray: BunqTransaction[] = [];