diff --git a/frontend/src/app/Services/auth.service.ts b/frontend/src/app/Services/auth.service.ts
index 4d0ed48..a4dff21 100644
--- a/frontend/src/app/Services/auth.service.ts
+++ b/frontend/src/app/Services/auth.service.ts
@@ -11,12 +11,25 @@ const httpOptions = {
 })
 export class AuthService {
   constructor(private http: HttpClient) {}
+
+  /**
+   * @param  {string} email
+   * @param  {string} password
+   * @returns Observable
+   */
   login(email: string, password: string): Observable<any> {
     return this.http.post(AUTH_API + '/login', {
       email,
       password,
     });
   }
+
+  /**
+   * @param  {string} email
+   * @param  {string} username
+   * @param  {string} password
+   * @returns Observable
+   */
   register(email: string, username: string, password: string): Observable<any> {
     return this.http.post(
       AUTH_API + '/register',
diff --git a/frontend/src/app/Services/data.service.ts b/frontend/src/app/Services/data.service.ts
index 412efb7..a11b78a 100644
--- a/frontend/src/app/Services/data.service.ts
+++ b/frontend/src/app/Services/data.service.ts
@@ -51,8 +51,8 @@ export class DataService {
    */
   public createTransaction(
     symbol: string,
-    time: Date,
-    count: number,
+    time: string,
+    count: BigInt,
     price: number
   ): Observable<any> {
     return this.http.post(API_URL + 'transactions', {
@@ -60,10 +60,11 @@ export class DataService {
         'Content-Type': 'application/json',
         Authorization: 'Bearer ' + this.tokenStorage.getToken(),
       }),
-      symbol,
-      time,
+      responseType: 'text',
       count,
       price,
+      symbol,
+      time,
     });
   }
 
diff --git a/frontend/src/app/Services/token.service.ts b/frontend/src/app/Services/token.service.ts
index f56b112..8460ed6 100644
--- a/frontend/src/app/Services/token.service.ts
+++ b/frontend/src/app/Services/token.service.ts
@@ -6,20 +6,42 @@ const USER_KEY = 'auth-user';
 })
 export class TokenStorageService {
   constructor() {}
+
+  /**
+   * @returns void
+   */
   signOut(): void {
     window.sessionStorage.clear();
   }
+
+  /**
+   * @param  {string} token
+   * @returns void
+   */
   public saveToken(token: string): void {
     window.sessionStorage.removeItem(TOKEN_KEY);
     window.sessionStorage.setItem(TOKEN_KEY, token);
   }
+
+  /**
+   * @returns string
+   */
   public getToken(): string | null {
     return window.sessionStorage.getItem(TOKEN_KEY);
   }
+
+  /**
+   * @param  {any} user
+   * @returns void
+   */
   public saveUser(user: any): void {
     window.sessionStorage.removeItem(USER_KEY);
     window.sessionStorage.setItem(USER_KEY, JSON.stringify(user));
   }
+
+  /**
+   * @returns any
+   */
   public getUser(): any {
     const user = window.sessionStorage.getItem(USER_KEY);
     if (user) {
diff --git a/frontend/src/app/Views/dashboard/dashboard.component.ts b/frontend/src/app/Views/dashboard/dashboard.component.ts
index a04fd72..3cb280b 100644
--- a/frontend/src/app/Views/dashboard/dashboard.component.ts
+++ b/frontend/src/app/Views/dashboard/dashboard.component.ts
@@ -45,8 +45,8 @@ const ELEMENT_DATA: PeriodicElement[] = [
 
 export interface TransactionData {
   symbol: string;
-  time: Date;
-  count: number;
+  time: string;
+  count: BigInt;
   price: number;
 }
 
diff --git a/frontend/src/app/Views/dashboard/user-dialog/user-dialog.component.ts b/frontend/src/app/Views/dashboard/user-dialog/user-dialog.component.ts
index ef4b05b..a777286 100644
--- a/frontend/src/app/Views/dashboard/user-dialog/user-dialog.component.ts
+++ b/frontend/src/app/Views/dashboard/user-dialog/user-dialog.component.ts
@@ -25,11 +25,17 @@ export class UserDialogComponent implements OnInit {
 
   onSubmit() {
     console.log(this.data);
-    this.dataService.createTransaction(
-      this.data.symbol,
-      this.data.time,
-      this.data.count,
-      this.data.price
+    console.log(
+      this.dataService
+        .createTransaction(
+          this.data.symbol,
+          this.data.time,
+          this.data.count,
+          this.data.price
+        )
+        .subscribe((data) => {
+          console.log(data);
+        })
     );
     this.dialog.closeAll();
   }