Hello . Is everything OK , there ?   I'm having a little trouble with this form .   What seems to be the problem ?   There are two types of L / C here and I'm not sure which one I want .   That's right , there's ' revocable ' and ' irrevocable ' . We usually go for the irrevocable one , it's the most popular .   So , I should choose that one ?   I would recommend it , yes . Then you just need to complete that form . 