https://www.grantthornton.com.ph/insights/articles-and-updates1/lets-talk-tax/e-invoicing-in-focus-what-taxpayers-need-to-know-before-the-december-31-2026-deadline/ Grant Thornton Philippines en 2026-09-08 E-Invoicing in focus: What taxpayers need to know before the December 31, 2026 Deadline