One more data point if it's of interest, followed by a question:

Datapoint: I have been playing around with an ex-JNB LONE5 in the online tool over the past week and there has been no major change in price for my itinerary. Specifically, the total fare (including taxes/fees) has moved from $2301 USD on 5/31 to $2313 USD just now (6/2). If of interest, the routing is JNB-GRU-AEP-SCL-IPC-SCL-AKL-SYD-PVG-HKG-DEL-NRT-BKK-AMM-IST-LHR-CPT with first carrier LATAM Brazil.

Question: This validates in the online tool and I am able to 'Proceed to Booking' without it erroring out. If I book this online through the tool, how likely is it I run into problems for having a US-address credit card?