> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.tunder.co/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How to join an existing shop ?


## **Join a shop in Tunder**

Would you like to use multiple devices with your Tunder POS? It’s possible thanks to the multi-device option.

> **The account owner must have a Premium subscription (2 devices or more).**

Then, a second device can join the shop through one of the two following scenarios.

> ✅ Make sure the user has **created an account and is logged in** (via Apple or Google). If you don’t see the “Join a shop” option, log out, sign in with your email, and make sure you are not using the app in trial/demo mode.

### **Case 1: You use the same email as the account administrator**

If you log in on the second device using the **same email** as the account owner:

* Open the Tunder app on the new device
* Sign in with the same Apple or Google account that was used to create the shop
* The shop is automatically synchronized — no further action is needed
* You will be taken directly into the existing shop environment

> ✅ If you are the shop owner and logging in with your original email, **you do not need an invitation code**. The code is only required when joining with a different email address.





### **Case 2: You use a different email address**

If the invited user uses a different email address, they must **create their own Tunder account** (via Apple or Google), then enter a code provided by the **account owner**.

#### **On the account owner’s side:**
* Open **Settings > Devices**
![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/image_4fi7ao.png =250x499)


* Tap the ➕ button in the bottom-right corner

![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/image_1lop4c1.png =250x504)


* A 6-digit invitation code will appear (valid for 3 minutes)

![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/image_1vcoqbq.png =250x482)
* Share this code with the invited user

#### **On the invited user’s side:**

* Download and open the Tunder app
* Sign in with your own Apple or Google account
* Tap **Join a shop**


![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/scr-20251106-tghj_11oxzar.png =257x521)




* You are now connected to the account owner’s shop

---

### Troubleshooting: "Invalid code" or unable to join

If you see an **invalid code** message or cannot join the shop:

* Make sure the invitation code was generated from the device already connected to the shop (**Settings > Devices > ➕**).
* Check that the code is still valid (codes expire after 3 minutes).
* Verify that the Tunder app is up to date on the device that is joining (check the app version at the bottom of the **Settings** page in the Tunder app).
* If you are using the **same email account** on both devices and the shop does not appear automatically, log out from **Settings > My account > Log out**, then log back in with the same email.

If both devices use the same account, they should display the same shop automatically after reconnection.

### Already created an account and want to join a shop?
1. Open the list of shops


### Already created an account and want to join a shop?
1. Open the list of shops

![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/image_tl6aw0.png =250x500)



2. Tap the “+” button
![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/image_3jiqal.png =250x507)
3. Join the shop

![](https://storage.crisp.chat/users/helpdesk/website/-/1/1/5/8/11586f3f280f9f00/image_1rk2er1.png =250x522)