Hi. Hindi po sila nagbibigay ng endorsement letter before you submit your application. You have to submit your application first and from there, if you have submitted all their needed docs for your case, that's when they send an email requesting you to either add supporting docs and a written explanation letter from NBI. Kaya a little advice lang po na it's better to submit all your court docs para there will be little chance for you to be refused at yung NBI written explanation letter na lang hihingin nila. Kasi mostly, pag di complete naibigay mong court docs, that't when your application will be refused at once and they won't ask you to get NBI written explanation letter na.
And fyi po, my name is not Cathy... hehe
I'm Ann.
If you still have questions, feel free to ask me. Goodluck!