Businesses should verify a supplier's GSTIN before making payments to ensure the supplier's GST registration details are valid. Visit the official GST portal and use the “Search Taxpayer” facility to check the GSTIN, legal name, trade name, registration status, and other available details. Compare these details with the supplier's invoice and business documents. Also, review the invoice particulars and applicable GST information before claiming input tax credit. Proper verification helps reduce compliance risks and avoid errors in business transactions. Understanding GST Registration fees is also useful when planning registration costs. Always maintain supplier verification records for accounting and GST compliance.