1 Answers
A:
Include the UPI transaction ID as a dedicated, fixed field in the e-invoice payment section (label it UPI Ref / Transaction ID) pulled directly from the ledger entry tied to that down-payment.
Render it next to Payment Reference and also store the parent/child UPI links (if split payments) so auditors can trace the full chain
Make the field immutable once the PDF is generated and include the purpose code/MCC only when required for internal/GST audits.
Log the export event (timestamp, invoice id, ledger reference, exported value) in your audit trail for traceability.
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