Paying now on FHR bookings

[smitrax]

I’m trying to hit a spend target on my Amex Plat card and want to pay for a FHR booking in advance on the Plat card but the only option is my BA card on the online drop down menu. Can I default to another card somehow or do I need to call up?

Thanks.

[Rob]

Very bizarre. There must be a way of clearing that out!