I had been trying to book a SCL/PMC for weeks on Latam website (
https://www.latamairlines.com/fr/fr) and had been failing systematically.
I tried again today and could get the the last page (payment).
I could enter the Visa card number but it kept asking me to enter it again. Payment did not fail. I was simply asked to enter it again and again and again...
Strangely enough it was not asking for the CVV (3 digit) number despite the page saying that cards with CVV could be used....
- This is when I had an idea
: the welcome page was telling me that the point of sale was Spain and payment in € (despite being on a website www.latamairlines.com/fr/fr)...
So I opened my VPN software and moved to Spain.
Bingo : payment page was slightly different (asking for the CVV number) and payment went through like a charm.
I got my tickets.