We integrate VK API into your mobile app, eliminating typical issues: error 5 (invalid token) and rate limits (code 6). With VKID SDK, these problems are solved via proper authorization code flow and using execute for batch requests. Our experience shows VKID SDK simplifies integration by 2x compared to direct HTTP requests to OAuth 2.0 – that's a 200% better development speed. Additionally, we ensure correct handling of edge cases: token revocation, captcha, media operations. This keeps your app stable even under high load. In 7 years of work, we have completed over 40 VK API integrations for iOS, Android, and Flutter apps, including projects with audiences exceeding 500,000 users. Our engineers know how to avoid common pitfalls: for example, if a user revokes a token, the app should correctly redirect to reauthorization, not crash. We build such logic at the design stage.
How to Authorize a User via VK ID
Official VKID SDK (iOS and Android) implements authorization code flow:
import VKID let vkid = try! VKID(config: Configuration(appCredentials: AppCredentials( clientId: "YOUR_APP_ID", clientSecret: "YOUR_SECRET" ))) vkid.authorize(with: AuthConfiguration(flow: .authorizationCode)) { result in switch result { case .success(let session): let accessToken = session.accessToken.value // Token for API requests case .failure(let error): print(error) } } Android:
val vkid = VKID(context) vkid.authorize( activity = this, config = AuthConfiguration.build { oAuth = OAuthListWidget.OAuthItem.VK } ) { result -> when (result) { is AuthResult.Success -> val token = result.token.accessToken is AuthResult.Failure -> // error handling } } Token is bound to user_id and scope (request wall, friends, email). Lifetime up to 1 year. Use refresh token from SDK for seamless renewal – it's 3x more reliable than reauthorizing from scratch.
What Does VK API Integration Include?
| Method | Description | Rate Limit (requests/sec) |
|---|---|---|
| users.get | User profile | 3 |
| wall.post | Post on wall | 3 |
| friends.get | Friends list | 3 |
| photos.getWallUploadServer | URL for photo upload | 3 |
| execute | Batch request (up to 25 methods) | 1 call |
Fix API version v=5.199. When exceeding rate limits, use execute – this speeds up work by 3x compared to individual calls, reducing throttling.
How to Handle Typical VK API Error Codes
| Code | Meaning | Action |
|---|---|---|
| 5 | Invalid token | Reauthorize via VKID |
| 6 | Rate limit exceeded | Use execute or pause |
| 15 | Access denied | Redirect to VK settings |
| 17 | Captcha | Pause 10 sec, on repeat use captcha_sid and captcha_key |
| 30 | Private profile | Notify user |
Error 5 is the most common: token may be revoked or expired. We automatically catch it and trigger reauthorization without losing user data. Error 6 is handled by batch requests via execute: one call can contain up to 25 methods, reducing request count and bypassing the limit.
What is the Two-Step Process for Photo Posts?
Attempting to upload an image directly via wall.post will cause an error. You need to:
- Call
photos.getWallUploadServer– get upload URL. - Send a POST request with the file to that URL.
- Call
photos.saveWallPhoto– getowner_idandphoto_id. - In
wall.post, specifyattachments=photo{owner_id}_{photo_id}.
A common mistake is skipping steps 2 or 3. Our engineers build handling for these edge cases so you don't waste time debugging. Additionally, we check MIME type and file size before upload to avoid error 100 (invalid file type).
Handling VK API Errors
On error 5 (invalid token), we reauthorize via VKID. On rate limits (code 6), we combine requests into execute. If the user denied access (code 15), we show VK settings. Captcha (code 17) is handled with a 10-second pause and retry; if the error persists, we use captcha_sid and captcha_key from the VK API response. The email field may be missing – do not rely on it for critical logic. We implement robust handling of all these situations so your app doesn't crash in production.
VK API Integration in Flutter and React Native
For Flutter apps, we implement the OAuth flow using flutter_web_auth_2, and for React Native using react-native-app-auth. This is more reliable than community packages. Our VK development covers both authorization and VK wall publishing, including media attachments and friends management.
Process of Work
1. Analytics – define scenarios (authorization, publishing, friends). 2. Design – choose SDK, scope, token architecture. 3. Implementation – write code, integrate VKID and API requests. 4. Testing – check edge cases (token revocation, errors, rate limits). 5. Deployment – publish to App Store / Google Play.Timelines and What's Included
- VK ID authorization + profile import – 1-2 days.
- Content publishing with media – 1 day.
- Error handling and custom logic – from 1 day.
Included in work:
- Integration documentation.
- Code signing and provisioning profile setup.
- Post-deployment support (1 month).
Cost is calculated individually – we will select the optimal budget for your tasks. On average, mobile app VK integration costs 2-3 times less than developing similar functionality from scratch. Typical projects range from $500 for basic authorization to $3,000 for full feature sets, saving you up to $5,000 in developer time. Order VK API integration – get a ready-made solution with guaranteed stable operation. Contact us for a free evaluation of your project.