You're crazy, I was going to post the same thing as you, so I'll elaborate on the principle:

Implementation of a rewards system:

For us in our dashboard:

1/ Creation of rewards with different stages that we can define in terms of quantity and time, for example, after paying for 3 boxes, the customer unlocks a reward that we have defined. We must have control over the different stages so that we can add to the rewards progression whenever we want.

2/ A bar with the different unlocking stages appears on the customer file. It increases with each shipment or payment so that we can track our customers' progress.

3/ Allow the duration of the rewards progress bar to be chosen, for example by year and by month. For example, over 1 year, I want to set 3 reward stages, which will be unlocked upon receipt of the 2nd box, the 4th box, and the 6th box.

4/ Allow the extraction of customer rewards data in CSV format, for example, a rewards column with the customer's stage number displayed to indicate that it has been unlocked and that we must add their rewards to this box.

5/ Unlocking will be automated and not manual. In other words, it is not up to us or the customer to say that they have unlocked their rewards; it must be automatic.

On the customer side:

1/ In their customer account, customers will see the rewards progress bar, with the different stages that have been set. It will progress gradually, with a color filling the bar, so that customers can understand and follow the progress of their rewards.

2/ To unlock the stages on the bar, hovering the mouse over the different stages of the bar will display a small image and text to show the unlocked products.

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As suggested above, this could also take the form of points collected as orders are placed, allowing customers to exchange the points in their customer account for reward items. This is also an interesting avenue to explore

Thx