I'm not sure if I am having a foreign credit card issue, foreign address issue, technology/browser issue, or what, but for quite a while now I have not been able to get the "Pay" button to go off gray when adding credit card details to pay for Indigo flights through the 6E App, Chrome, or Edge browsers. I have been sort of ignoring it because at some point (when it was all still working) I had my Citi Prestige card added to my saved payment methods, and that has been working fine ... until today. I went to buy a DEL>BOM ticket, got it all set up,etc, went to the payment screen, selected my saved Citi card radio button, and then 'boom', the Indigo website wants me to add my address on the next page. I did, and of course the "Pay" button stayed grayed out.

I ended up just buying through an OTA to get it done, but does anyone have a solution? I prefer buying through airlines directly, especially Indigo, because I like to get the Super6E fare, for the XL seat and extra kg's of luggage, and I usually add Fast Forward.