How do I redeem a code?
Last updated: 2 November 2026 · The MargenOptimierer app is in German. Button and menu names are shown exactly as you see them, with the English meaning in brackets.
You enter a code in the Rabattcode (discount code) field when you sign up. The notice under the field then names its benefit, which is a longer free trial, a discount or both. Some codes only apply to an OTTO account that has never been connected to MargenOptimierer, and the notice says that too. With such a code, you only know for certain whether you get the benefit when you connect your first OTTO account.
How it works
- When you sign up, enter your code in the Rabattcode field, or open the link with the code that you received.
- Read the notice above the form. It names the benefit, such as how many days you can test for free.
- Create your account, as described in How do I sign up?
- Connect your OTTO account, as described in How do I connect my OTTO account?
Example: 10% discount for 3 months
Say the text above the form reads „Mit Code MESSE-27: 10 % Rabatt für 3 Monate.“ (with code MESSE-27: 10% off for 3 months). The 3 months are the three monthly invoices after your free trial, even if the first one only bills part of the month. If your free trial ends on 20 November 2026, you get the 10% on the invoices of 16 December 2026 for November, 16 January 2027 for December and 16 February 2027 for January.
If the code doesn't work
The code isn't valid
The notice above the form then says why, for example „Dieser Code ist abgelaufen.“ (this code has expired). You can still sign up, just without the benefit.
Your OTTO account was connected before
If your code only applies to a new OTTO account and yours was connected to MargenOptimierer before, you don't get a benefit. If you received the link from a company that recommends MargenOptimierer to you, this condition always applies. If your OTTO account previously belonged to another company at MargenOptimierer, every benefit is lost. When that happens is covered in How do I connect my OTTO account?
Entering the code later
That's not possible. You can only enter the code when you sign up, and there's no field for it later.
Next
- How do I sign up?
- How do I connect my OTTO account?