We were married in the British Embassy in the country where we were both working.
First we had to have an interview with a Philippines' Consular official and get a letter to take to the British Embassy. At the British Embassy we had an interview with a Consular official and got another letter to take back to the Philippines Embassy.
To fulfill the requirements of both Embassies took around 6 weeks, mainly waiting for the (Philippines) PSA/NSO to respond to their Embassy's request for my (now) wife's "no report of marriage".
When all the forms were in and approved, both Embassies posted the banns.
We had to give the Philippines Embassy 2 certified copies of our (British) marriage certificate. One they passed onto the PSA/NSO in Manila, where it took around 6 months for the marriage to be seen as recorded on their database. The other they used to issue a name change in my wife's (Philippines) passport.
It took around 9 or 10 weeks, but well worth waiting for.

We were married in the beautiful Embassy gardens, next to the "emergency fire fighting water containment area". aka, but not officially, the swimming pool. LOL!
When we were next in the Philippines, we got a copy of the NSO marriage entry, complete with red ribbon.
Peter