Is the 35% rate ever going to change?

35% is the standard rate and it is stored on your partner account, not hard-coded into the payout calculation.

Every ledger row records the rate that applied at the moment it accrued. That means a rate change can never rewrite your history: commissions already accrued keep the rate they were accrued at, whatever happens later.

Under §10 of the agreement, program terms can be amended prospectively with 14 days' notice. Continuing to participate after the effective date is acceptance. If a change ever affects your rate, you will see the new rate on your dashboard and the old accruals will still show the old one.