Carte de fidélité Auchan Waaoh !
At first I thought this was an expletive emitted by the author of the article to express their displeasure, but it seems that Waaoh ! is the name of the card… 
I guess it also depends what supermarkets you have available near you - in Charente and Vienne for example it seems to be mostly Super U with a smattering of Intermarché - Carrefours are few and far between.
Thanks. I learned some things from that.
I am bummed because it looks like Lidl has discontinued its hokey scratch off coupons and roulette in favor of basically what amounts to a one percent discount. As a now single person with limited need for food, it will take years to profit from their new scheme, whereas I was always treated to something almost daily (whether or not I liked it) , it seemed,
In the good old days 
every euro one spent counted towards your “balance” to be redeemed eventually.
Nowadays it’s far more complicated.
I’ve emailed the link to OH so that he can read, inwardly digest.. and then tell me which of our many cards offers us best value and thus which shops we should be using.
Must confess that nowadays we buy from local growers etc wherever possible, but some things are shop-bought and might just as well earn us a little bonus 
EDIT: I’m pleased to note the shops which offer extra help to the Mums+Babies group.
To shop at max economy would take hours as before you put each item in your basket you would need to compare actual price with other shops, and then with potential loyalty card bonus.
A great bonus scheme is rubbish if the products you habitually buy are more expensive in this shop.
Our nearest big shop is now Leclerc and I went in today to sign up for a loyalty card. I left without one. First off once I said I wanted to sign up ( in French obviously) the assistant replied in English, which is just plain rude to me. Especially as it was bad English and my French is fine, I just have an accent. Then the whole process was on a tablet which took about 10 minutes, and then on the last question wiped the whole form. The assistant just shrugged and said that it happens frequently.
I’ll sacrifice a few centimes for decent customer service and continue going to BioCoop across the road.
Lots of younger French people want to use their English, so although it’s not the response I want, I usually accept it, unless their English is better than my French.
Re loyalty cards/ most of mine are for gardening stores where we buy sacs of pellets for the stove and where the rebate is immediately relatively noticeable.
FWIW, I have a selection of the French supermarket loyalty card apps on my phone. I signed up online and they were happy for me to put in a UK home address (I just had to chose a “home” store in France).
That said since I am just a visitor not a full time resident I don’t worry about the loyalty points too much, but it’s handy to be able to check what’s on offer before I go shopping, and waving my phone at the machine does head off the usual conversation about “Avez-vous une carte de fidélité, Monsieur?”
It’s not at all unusual for people to speak a little English when they hear me and, as I know how much courage is needed to try and speak a foreign language, I feel for them.
I continue to speak French and we take it from there Had some quite useful exchanges as a result.
Only last week, the cashier decided to mumble a question to me in English (=did I want the ticket) and I replied in French “oui, merci”… he smiled and I then paused and asked the question: C’est mieux a dire “oui, merci” ou “merci, s’il vous plait?”
and he considered for just a moment then replied “les deux”.
Phew, so that’s alright… I nearly always say “oui, merci” as it flows off the tongue without me wondering about vous/tu.