That sounds fun receiving 7 callbacks for the same payment 😮.
Did this happened in the sandbox environment or production ? If it was sandbox (which is fake data), could you please list your sandbox user ID and payment ID. I'll see if I can find some information why you're receiving so much callbacks.
If it is on production however, could you contact a colleague of mine via the support chat and then just mention this post and give them the payment ID of which you're receiving these callbacks of.
It sounds like our retry mechanism is being activated even thought the POST request is correctly handled 🤔.
To confirm my theory, are you receiving these callbacks at an interval of 1 min as described here: https://doc.bunq.com/api/1/page/callbacks