Seams ripped. You can resew them. Or if wallet is leather, apply a thin coat of Pliobond cement to both edges. Let dry until tacky and press edges together. On plastic wallets, use plastic-mending adhesive.
Leather or plastic worn through at fold. Out of thin matching or complementary material cut a strip that will overlap the sides of the holes and will wrap over the top and bottom edges of the wallet about 1/4" Glue up and down the fold and at top and bottom on the inside with appropriate glue (see above).
Ornamental metal corners off. Coat the groove in the metal corner with Duco cement, place on corner of wallet and crimp lightly.