Muhamad Trisno, and Hermansyah. “WEBSITE BASED PPOB SALES SYSTEM AND INTEGRATED WITH WHATSAPP GATEWAY CASE STUDY OF CREDIT COUNTER”. Jurnal Rekayasa Sistem Informasi Dan Teknologi, vol. 3, no. 1, Aug. 2025, pp. 29-42, doi:10.70248/jrsit.v3i1.2252.