OfferUp has INTEGRATED Stripe as their payment processor, which is how your transaction is being conducted.
"3.iv. Receiving Sales Proceeds" is NOT EXCLUSIVE for shipping, so..."If the buyer is paying with Stripe, then the seller must enroll in Stripe."...still applies.
Feel free to call me whatever you want via PM's, since it is not allowed in the forums. I take no offense by mere words.
Offerup Payment Solution is a prerequisite for shipping. You agreed to use the "Offerup Payament Solution" when you agreed to the shipping process. Now, if you look closely below, it also specifies that you have agreed to Stripe's TOS by agreeing to use the OfferUp Payment Solution. If you read towards the end, when you agreed to shipping, you basically agreed to the following:
1. Stripe handling the money processing.
2. Stripe can hire another 3rd party to handle the money processing at their will, which is another contingency.
"ii. Sellers. By using the OfferUp Payment Solution to accept Electronic Payment Methods, you are entering into an agreement with Stripe subject to the terms of the Stripe Connected Account Agreement, which includes the Stripe Terms of Service (collectively, the “Stripe Services Agreement”). Notwithstanding anything to the contrary in the Stripe Services Agreement, you will not have the right to have Stripe, and will not request that Stripe, transfer any buyer data Stripe collects via the OfferUp Payment Solution to an alternative payment processor. Except for the foregoing restriction that supersedes any rights you may have in the Stripe Services Agreement, the Stripe Services Agreement is separate from these Terms. OfferUp is not a party to the Stripe Services Agreement and will not be liable or responsible for the payment services provided by Stripe. If Stripe discontinues providing services in connection with the OfferUp Payment Solution, you authorize Stripe to share your payment method information with an alternative third-party payment processor that is or will be integrated into the OfferUp Payment Solution."