# How uandu GmbH Generated €5,312.53 with a WhatsApp Hack

> How uandu GmbH Generated €5,312.53 with a WhatsApp Hack  → WhatsApp Marketing mit Chatarmin.com

Source: https://chatarmin.com/en/customers/uandu

Company: uandu GmbH  
Industry: Lifestyle  
Published: 2025-10-02

## Results

- WhatsApp Revenue: €5,312
- WhatsApp Spend: €974
- ROWAS: 5.45x

## Initial Situation

**uandu GmbH**, an innovative online retailer for lifestyle and everyday products, wanted to make their Halloween campaign more efficient.
The goal: **generate more revenue per campaign – without driving up WhatsApp META costs unnecessarily**.

## Solution: Retargeting Within the 24h Conversation Window

With Chatarmin, uandu applied a clever **WhatsApp hack**:

![uandu 2-Teilige Halloween Kampagne whatsapp](https://cdn.sanity.io/images/vmmgqf0p/production/5c6ac4afebb28a9eb4e2028fc933760523cb038e-1074x1073.png)

- **Second message to non-buyers**: All contacts who did not convert after the first message received a follow-up just a few hours later.
- **Cost savings**: Since both messages were sent within the 24h window, META costs were only charged once.
- **Klaviyo + Shopify integration**: Enabled easy creation of a non-buyer segment and automated follow-up messages.

## Results

This smart Halloween campaign delivered impressive results:

![uandu 2-Teilige Halloween Kampagne KPIs](https://cdn.sanity.io/images/vmmgqf0p/production/16cd2e5b3527b8672b988c172bbd3257bf89bcda-1071x1072.png)

- **€5,312.53 WhatsApp revenue** 💰
- **€974.39 WhatsApp costs**
- **5.45X ROWAS** 🚀
- **€51.60 AOV** 📦

## Conclusion

This case study shows how **WhatsApp retargeting within the 24h conversation window is a true performance booster.**
By combining **precise segmentation**, **smart cost optimization**, and **automated setup through Chatarmin**, uandu significantly increased the efficiency of their WhatsApp campaign.

👉 Want to learn how your brand can leverage WhatsApp retargeting?
[Talk to our team](https://chatarmin.com/demo)