... this is incorrect.
If u book via a third-party here in the UK (eg Opodo, Asda travel etc), it is
they that take "responsibility" for validating your credit card.
In this case, the credit card is "vouched" for by the agent in the UK, so no
requirement to present it when checking-in in Manila.
HOWEVER...... after booking via an agent / website in the UK, you will need
to contact the relevant airline (eg QATAR), and give them the passport No.
of your wife/fiance.... which they will cross check against her passport when
she does check-in.
(If memory serves me.... either the airline or the agent alsosend her an e-mail
asking for this info).
So, YES you can book a ticket by your Credit Card from here in the UK.