Stripe fees differ across platforms

While evaluating various class booking software, we realised transaction fees (Credit card, SEPA etc) differ across platforms. For example, Eversports charges a whopping  2,9%+0,46€ for CC and while Bsports slightly lesser but still higher than what Stripe listed on their website.

When I emailed Eversports on a late evening at 1600+ hours that the charges are too high, they came back in 2 hours reducing the fee by a little but still highest amongst all platforms. They claimed they take no commission from Stripe transactions and had asked Stripe about reducing the fee based on our revenue and came back to us on the reduced rate. I find that unbelievable as I do not think Stripe would answer them in two hours on a late evening. I asked why they have differing rates from other software vendors, they claimed Stripe has different contracts. I find that unbelievable as well.

In fact many vendors simply use the rates Stripe listed on the official Stripe website and may only charge tiny payout fees at times.

I wonder if anyone has similar experience. I do think Eversports earn commission from the transactions given their high fees.