https://www.gob.mx/curp/
When you have the page that looks like a little certificate in red, save that to a file and copy to a memory stick.. it will be a PDF file... take the memory stick to a papaleria, or someone with a printer or if in Melaque just down from the delegado's office..
Cost is 10 pesos for 2 color copies. You should make a copy of your residente card too.. both sides.
Leave nothing to chance.
DNA sample not required..... yet.
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Be sure to visit www.lamanzanilla.info for more information about La Manzanilla Mexico.