Is $PYPL's buyback hiding a checkout problem?

I keep seeing the PayPal bull case reduced to "it's cheap and they're buying back stock." That might work, but the Q2 numbers make me want to ask what exactly the remaining shares are buying.

$PYPL processed $486.4 billion of payments in Q2, up 10% from a year ago. Revenue rose 5%. Transaction margin dollars excluding interest on customer balances rose 3%. GAAP operating income actually fell 5%. So the platform is handling a lot more money, but the extra volume isn't flowing through at the same rate to profit.

The mix seems to be the issue. Braintree's unbranded processing is growing, and it has different economics from the familiar PayPal checkout button. In its 10-Q, PayPal says the bigger Braintree share of volume pushed up transaction expense rates. It also says revenue grew more slowly than payment volume because of product mix, higher co-marketing with merchants, lower FX fees and other items. That is a more useful explanation than the vague "payments are growing" line.

There are signs the old network hasn't disappeared. Active accounts were about 439 million, roughly flat year over year. Transactions per active account rose 3%, or 7% when unbranded PSP activity is stripped out. Management says branded checkout has stabilized, but I'd like to see that show up in durable margin dollars rather than just in a presentation slide.

The buyback is real: $1.5 billion spent on roughly 33 million shares in Q2, and $6 billion on about 111 million shares over the trailing year. If the core economics hold steady, shrinking the share count could do a lot of work. If profit per dollar processed keeps slipping, the repurchase program may only make the per-share picture look better while the actual business gets weaker.

My simple watch list for the next couple of quarters: transaction margin dollars excluding interest, GAAP operating income, branded checkout progress, and the net diluted share count after compensation. A bounce in payment volume alone would not settle this for me. I also want to know whether the company has to keep paying merchants more to win checkout placement.

Does anyone here see the current mix shift as a temporary transition, or is low-margin processing becoming the permanent center of PayPal's business?

Sources: PayPal Q2 2026 results, PayPal Q2 2026 Form 10-Q