Best Free Payment Gateway in 2026

Recommend NetBanking (IMPS/RTGS/NEFT) as the primary fallback for high-value vehicle down payments.

Offer debit/credit cards only if the dealership supports large-ticket transactions.

Use split UPI only when dealer and PSP policies allow it.

Show a clear UPI limit reached, choose another payment method prompt to prevent checkout failure.

Use idempotency keys + a strict retry cap-e.g., max 3 retries, only on timeouts/5xx-so duplicate UPI charges can’t occur.

Apply exponential backoff with jitter and a circuit breaker that opens when latency/error-rate crosses thresholds and pushes retries to a delayed queue.

Enforce concurrency limits per merchant for hospital merchants, queuing excess requests with a short TTL.

Log every retry decision and expose metrics/alerts for retry count, latency, and circuit state so that ops can tune thresholds safely.

Tag each payment with the healthcare/hospital MCC/purpose code and verify the hospital is NPCI-verified for high-value UPI.

Before authorising, check the bill against the configured per-transaction and 24-hour aggregate caps for that category (or lower bank/PSP limits).

Block or auto-split any UPI request that would breach these caps.

Log the cap check result with UPI txn ID, purpose code, merchant verification flag, amount, and daily aggregate for audits.

Enable a daily aggregate cap alert when vehicle down-payment UPI receipts approach the ₹10L per-day limit.

Add a high-value payment alert for down payments nearing the ₹5L per-txn cap.

Use an unmapped-purpose alert to flag transactions missing the automotive purpose code/MCC.

Enable a settlement mismatch alert when UPI receipts don’t reconcile with down-payment invoices or ledger postings.

Tag the transaction with the automotive/vehicle purpose code/MCC and confirm the dealer is NPCI-verified for high-value UPI.

Enforce the updated ₹5L per-transaction and ₹10L per-day caps (or the lower bank/PSP limit) before posting.

Block or auto-split any down payment that exceeds these limits.

Store the UPI txn ID, purpose code, merchant-verification flag, and cap-check result for audit and reconciliation.