If you are a good customer, I will show you how work together based on mutual trust.
I know you worry about losing money, which is why you only buy one card at a time.
But you will always have trouble working this way,Today may be lucky you can buy a card with high balance and work, but tomorrow you can buy bad and not work
The card is hacking data which is why it can not be 100% sure it works, based on many factors and specifically how your formula works okay?
If you have your own recipe, why not invest in one for a profit and not have to worry about working with me later.
This is how my shopper works, he buys more than 10 cards to get the discounted price, and I always prioritize the bin he asks for.
We worked for 6 months, both very happy.