Did the whole C-402 135 out of FLL before going into the 170, very familiar with APIS. Where it said Passport/Visa on the link (old APIS form online) I just left it blank and under NUMBER, I typed in Birth Cert.
That was using nbaa.com APIS site.
I have a program that was made where it stores all of the pax apis information, pilots, departure/arrival cities. Made doing an APIS really easy with thr program than that nbaa website where you had to type EVERYTHING IN (took forever).
Customs just wanted to make sure the APIS WAS FILED. I always tripled checked my apis form and made sure all the info (passport numbers, birth dates, names, nationality) were correct. You do not have to put a birth cert # on the apis form, just birth cert under passengers name.
Stop flying to the bahamas June of '04 so Im sure it hasnt changed drastically but if you have any other questions, shoot me a PM