To enroll GCash as a payment method for Facebook Ads, follow these steps:
STEP 1: Open a web browser and visit Facebook Business Suite
STEP 2: Click your More Tools
STEP 3 Click Billing
STEP 4: Click Payment Settings
STEP 5: Click Add Money
STEP 6: Click Add Payment Method
STEP 7: Input Philippines as your Country/Region and Philippine Peso as Currency. Click Next