@KimBokJoo @Noodles12 we applied for partner visa and we're married but I would assume na same lang for de facto relationships.
in our case, we provided personal stat declaration and had it witnessed by a justice of peace. dun sa stat dec namin, I put it in bullet points yung history ng relationship namin - when and where we met, pano na develop ang relationship, kelan kami nagpakasal and how is our setup as a married couple. just simply be honest. our stat dec is just one page bulleted list.
then i also provided joint bank statement, photos, travels, airfare tickets together compiled in pdf , and form 888 from two friends, viber chat and fb messenger history screenshots. yun lang. ung form 888 pala, ako na din nag bigay ng brief summary na pwede isulat ng friend para mas mapadali sa kanila. as long as true ang statement.. nothing to worry naman.