Systems Interchange
Interface Contract Blueprint
Define the interface before implementation so partners, frontend teams and support can work from one contract.
9 working days18% GST INCLUDED
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Systems Interchange / BS-023
Connect checkout to your payment provider with reliable order handling, verified callbacks and reconciliation.
01 / THE PROBLEM THIS SOLVES
Connect checkout to your payment provider with reliable order handling, verified callbacks and reconciliation.
This engagement is designed for products moving beyond standalone payment links and businesses needing reliable payment-to-order reconciliation. The work stays within the deliverables below, so the expected result can be reviewed before purchase.
02 / WHAT YOU RECEIVE
UPI, card, netbanking and wallet payment integration.
Idempotent order creation for repeat submissions.
Signature-verified webhook processing safe for retries and replay.
Full and partial refund actions in administrative tools.
Daily comparison of settlements against your own records.
Recurring subscription or mandate handling when applicable.
A sandbox test plan including deliberate payment failures.
03 / EXPECTED OUTCOMES
04 / WHAT WE NEED FROM YOU
Third-party subscriptions, usage fees, paid licences and work not listed under “What you receive” are excluded unless confirmed in writing before purchase.
05 / BEFORE YOU BUY
Yes for the listed scope. The price is in INR and includes 18% GST. Any authorised discount or project-specific adjustment is shown in the order review before payment.
The timeline begins after payment, the completed brief and all required inputs have been received. Late inputs move the expected handover date.
Use “Ask about this service” before buying. We will confirm whether the request fits, recommend another service or explain that a separate scope is needed.
Ownership and account handover are governed by the accepted engagement and Terms. Delivery is made into accounts and repositories controlled by your organisation unless the engagement states otherwise.
Each unit repeats the published scope once. It does not expand one unit beyond the limits stated on this page.