Billing & GST invoices

Raise a GST tax invoice for a visit with statutory per-clinic numbering. The place-of-supply decides the tax: same state → CGST + SGST, different state → IGST.

• Line items carry HSN/SAC, taxable value, GST rate and the tax split.
• Record payments (cash / UPI / card); the invoice moves to partial or paid. Overpayment is rejected.
• Consult and pharmacy lines merge into one bill per visit — the patient pays once.
• Download the tax-invoice PDF with amount-in-words.