Systems Interchange
Payment Flow Integration
Payments end to end across UPI, cards and netbanking, with webhook signatures verified and settlements reconciled daily under production load.
₹26,999GST included
Systems Interchange
CR-ITC-101
Interface Contract Blueprint
A versioned interface contract, published documentation with examples, and a mock server that lets a partner start building the same week.
Timeline9 working days
Deliverables7 itemised
PracticeSystems Interchange
Price₹20,999 incl. GST
01
The problem this solves
Integration goes faster when nobody must work your endpoints out backwards. Whether we design the interface or document the one you have, resource names stay consistent, paging and filtering behave predictably, errors name the field at fault, and the versioning scheme leaves room to change. The specification ships in machine-readable form, alongside a console to browse it and a server that mocks it. A precise contract is also easier for AI coding assistants to follow.
02
What you receive
- Machine-readable API specification describing as many as 40 endpoints
- Settled conventions for paging, filtering, sorting and error payloads
- A documentation site carrying worked request and response examples
- Mock server produced from the specification, for partners to test against
- A guide to authentication, covering keys, tokens and rate limiting
- Written policy on versioning and on deprecating an endpoint
- A prepared collection of sample requests for support staff and partners
03
What changes afterwards
Integration proceeds without a long exchange of clarifying email
Client work begins against a mock rather than waiting
A breaking change becomes a planned release instead of an incident
04
Is it the right fit?
Ideal for
- Organisations whose interface documentation sits in a spreadsheet
- Products beginning to open up to partners or customers
- Front-end and back-end teams who keep disagreeing about payloads
What we need from you
- The codebase, or a list of the endpoints that already exist
- One engineer available for a pair of design conversations
- Any partner requirement or contract term the interface must satisfy
05
Before you buy
Yes. It is in Indian rupees with 18% GST included, and it is exactly what you pay at checkout. Nothing is added afterwards for the scope listed on this page.
The working days are counted from the day we hold your payment, the completed brief and everything listed under “What we need from you”. If an input arrives late, the handover date moves by the same number of days.
Ask before you buy. We will confirm in writing whether it sits inside this scope, point you to a better-fitting service, or tell you it needs separate work.
On full payment, the code, configuration, designs and documents produced for this service belong to your organisation, as set out in our Terms.
Each unit repeats the listed scope once. It does not stretch a single unit to cover more.
Often considered alongside
Systems Interchange
Customer Messaging Integration
Order updates, reminders and support replies carried over an official business messaging channel, with templates approved and delivery tracked.
₹24,999GST included
Systems Interchange
Legacy Interface Gateway
A REST gateway fronting legacy SOAP and mainframe systems, so a new product no longer inherits the limits of an old one.
₹37,999GST included