01 /
Payment gateways
Payments, refunds, and payment statuses with notification handling and reconciliation.
Integrations / API
API integration
with a traceable data exchange.
We connect your product to CRMs, payment and accounting systems, and third-party services: a data exchange with validation, retries on failure, and a log that shows what happened.
API
Webhooks
Payments
Retries
Data exchangerazrabotchik.com / API
Your product01 / PRODUCT
Integration layer02 / CONTROL
External service03 / SERVICE
Retries without duplicatesExchange log
Starting point
Your system and the partner API
Exchange
Requests, webhooks, sync
Control
Errors, retries, reconciliation
When it matters
Connecting an API is easy. Making the exchange reliable is separate work.
External services respond slowly, change formats, and send notifications twice or not at all. An integration has to survive that without double charges, lost orders, or manual reconciliation.
An estimate needs the partner’s API documentation, exchange scenarios, and timing and volume requirements. If documentation is missing or wrong, the first step is to establish how the service actually behaves.
02 /
CRM and accounting systems
Customers, orders, stock, and documents synced between your product and an accounting system.
03 /
Third-party services
Delivery, marketplaces, banks, messaging, and other partner APIs.
Delivery
Scenarios and failures first, then code.
01 /
Study the API
Documentation, limits, authentication, and the service’s real behaviour.
02 /
Define the exchange
What is sent, when, in which direction, and what happens on error.
03 /
Build it
API client, webhooks, a queue, retries, and duplicate protection.
04 /
Monitor and reconcile
Request logs, failure alerts, and regular data reconciliation.
Example approach
Paying for an order through a payment gateway.
The order gets a payment ID before the customer is sent to pay. The gateway’s notification is verified by signature and processed once, even if it arrives twice. If no notification arrives, the payment status is polled on a schedule. Requests and responses are kept in a log.
This is a possible solution pattern, not a completed client project.
Product ↔ service
Every event once. Every failure visible.
Signatures · idempotency · reconciliation
Questions
Which services can you integrate?
Any service with an API or file exchange: payment gateways, CRMs, accounting systems, delivery services, marketplaces. Each service’s limits are checked before the estimate.
What if the service’s documentation is poor?
Behaviour is checked in a sandbox or with safe requests; differences from the documentation are recorded and handled in error processing.
Will our product need changes?
Usually the integration lives in a separate module or service to keep changes to the main code small. The scope depends on the product’s architecture.
What happens when the partner changes the API?
External APIs change, which is why logs and failure alerts matter. Post-launch support — monitoring and updates for new API versions — is agreed separately.
Next step
Describe your challenge.
Describe the system, goal, and constraints. You will receive a proposed next step, delivery format, and plan for technical oversight.