Any idea of Payback card from REWE, LIDL etc

Can anyone tell me what is the use of payback cards here and how it works in Rewe and LIDL.

if possible, any other...

:) Many different schemes
Payback is the most well known  - For example for DM, kaufhof, karstadt aral (bp) are all in a partnership.

Every 1€ spent is 1 point.
Payout Every 100 points is 1€. So every 100€ Spent gives 1€ discount.

The reason why the shops participate is that they can all share in learning about your personal buying behaviour :

1) how much do you spent per month on groceries, fill your car, ..., where you purchase.
2) how much a demographic spends on groceries.
3) trends - what type of food a demographic spends (bio, tolerance to flavourants,...,
4) more targeted ads that on facebook, amazon, ebay, google searches, and flyers to your home.
5) price sensitivity, how long you shop around, so that they don't have to give you too much discounts.
6) sudden behaviour changes in your buying pattern ( usually a sign of new job, pregnant, switching partners, new friends)

For 1/100 cent you sell your soul.

I dont have it myself (thinking now to get it) but a friend has got mamy things for free from Rewe and Real such as knifes, frying pans etc.

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