Originally Posted by
bugsy
From the way I read some of the OP's latter posts - it was not a matter of having problems using the AMEX card, but rather that when confronted with the payment page they changed their mind about using it due to the requirement to present the card at check-in - as the card holder wasn't traveling (guessing they didn't see the tick box about cardholder not traveling)...had they chosen to continue paying with the AMEX it probably would have gone through no problems.
Edited: Actually rereading they may have had issues with using the AMEX via Paypal, after choosing to use paypal as the alternative method of payment (rather than AMEX directly on the BA site due to the above reason), and therefore chose to do the transfer to paypal (rather than AMEX via Paypal or AMEX direct to BA).
My real problem was not the payment issue as it only showed my inexperience in using Paypal vs Amex on the BA website and me getting unsure about using Amex for another passenger but really it was the way BA customer services handled this issue. They saw in their system that there was an attempt to make this booking though no booking number was generated and they just kept saying (rudely) that it is the fault of the system, they cannot help it and it sounded like it was not their first time. IMO AMEX via Paypal was rejected by BA and not by Paypal as I am using Paypal very frequently this way and it has never been a problem anywhere else yet.