Hi John,
Everything can be authenticated in the DFA ... it costs 100 pesos and five working days. Drop it in on a Monday and collect on a Friday.
As you know I'm married to a Filipina and live in Spain. Cecille had our marriage certificate authenticated at the DFA and deposited at the General Register in the UK.
She also had her NBI authenticated at the DFA.
The UK marriage certificate is now being translated by a "sworn translator" in Caceres in preparation for her residency application.
So authenticate at the DFA first, then have it translated in Spain.
Dave