Payment shall be made in the place designated in the obligation.
There being no express stipulation and if the undertaking is to deliver a determinate thing, the payment shall be made wherever the thing might be at the moment the obligation was constituted.
In any other case the place of payment shall be the domicile of the debtor.
If the debtor changes his domicile in bad faith or after he has incurred in delay, the additional expenses shall be borne by him.
These provisions are without prejudice to venue under the Rules of Court. (1171a)
SUBSECTION 1. Application of Payments