Third-Party API and System Integration Services
Third-party API integration is the work of connecting the software your business already runs to the APIs other vendors publish: the payment gateway, the customer relationship management (CRM) platform, the accounting or enterprise resource planning (ERP) system, the shipping carrier and the shop. Eicra Soft Limited, a Dhaka-based company, maps each vendor’s fields and rules for international clients, then writes, tests and documents the code in your cloud, sandbox first.
You can walk away after any step; no contract ties you in. We start with the one hand-off that costs your staff the most re-keying today: orders into accounting, leads into the CRM, shipments back to the shop. Its systems, fields, volumes and failure cases are mapped, and the smallest integration that removes the re-keying is costed in your numbers.
You get a written verdict — one API connected, a two-way sync, an integration layer across several systems, your own API or nothing yet. If no integration is worth building, you stop there.
30 minutes 01 Scope · free call
2 weeks 02 Diagnose · $1,500, half credited to the pilot
4–6 weeks 03 Pilot · $4,000 fixed
In stages 04 Production · from $6,000, quoted after the pilot
Monthly 05 Managed Ops · optional, cancel any month
What Do API Integration Services Include?
Third-party API integration is the work of connecting the software you run to the APIs other vendors publish. Our services cover every kind: payment gateways, CRMs, accounting and ERP systems, shipping carriers and marketplaces, plus the API you may need to publish yourself. Each ends with tests, monitoring and documentation your team can keep.
Payment Gateway Integration
Card, wallet and bank-transfer payments wired into your shop, portal or invoicing system: checkout, refunds, webhooks for settlement, and reconciliation back to accounting. Each payment, refund and settlement event is mapped to its accounting record before code is written, tested against the gateway sandbox, and signed off by your finance team before production keys are issued.
CRM Integration Services
Leads, accounts, deals and activities kept in sync between your CRM and the systems around it, with field mapping, ownership rules and duplicate handling written down. Changes move by webhook or on a schedule, failed calls are retried and logged, and the sync runs in your own cloud with your CRM credentials held in your vault.
ERP and Accounting Integration
Orders, invoices, payments and stock moving between your ERP or accounting platform and the systems that create them, reconciled daily and logged. Each field has one owning system written into the data contract, so finance and operations read the same order and stock records, and a reconciliation report lists every mismatch before anyone has to hunt for it.
Shipping, Logistics and Marketplace APIs
Carrier rates, labels and tracking, warehouse stock levels and marketplace orders connected to your own systems, so status flows both ways without a person copying it. Carrier and marketplace API versions are pinned and monitored, so a vendor change raises an alert before orders stop moving, and every call is logged for your operations team.
Custom API Development
Your own documented, versioned API in your cloud, so partners, customers and your web application read and write your data safely, with keys, limits and logs. Authentication follows the OAuth 2.0 standard, rate limits and versioning are set before launch, and the documentation and tests live in your repository so your team can extend the API after handover.
Integration Monitoring and Maintenance
Alerts on failed calls and vendor deprecations, version updates, re-tests and a change log on a monthly plan, with a named engineer who knows every connection. Vendor change notices are read as they arrive, each update is re-tested in the sandbox before release, and a monthly review call walks through the log. Cancel any month; everything stays yours.
Not included: Language models that read or write your data and no-code integrations, both separate services · rewriting old custom software, which is legacy modernisation · new scope, priced first as a change request.
Do You Handle Full System Integration?
Yes, enterprise system integration is the wider job: four or more systems, one data model and one monitored integration layer in the middle. Finance, sales, operations and the warehouse then read the same order, customer and stock records. It is part of our custom software development work, built in stages, one connection live and watched before the next.
Central Integration Layer
One middleware or service in your cloud that every system talks to, instead of point-to-point links nobody can map. Finance, sales, operations and the warehouse then read the same order, customer and stock records through one monitored layer, and a new system joins by connecting once rather than to every other system in turn.
Data Contracts and Mapping
Which system owns each field, how values are translated, and what happens on conflict, written down before code. The data contract is the document your team signs off before the pilot is built, and the reconciliation check is measured against it, so a mismatch in production is traced to a rule rather than a guess.
Event-Driven Data Sync
Webhooks and queues that move changes as they happen, with retries and dead-letter handling when a system is down. A change in one system reaches the others within the same flow instead of waiting for a nightly batch, and when a vendor is unavailable the queued events are held and replayed once it returns, with every attempt logged.
Legacy System Connectors
Adapters for the old custom software you still run, so it joins the integration layer without a rewrite. The connector reads and writes through whatever interface the legacy system already exposes, translates its fields to the shared data contract, and is tested against recorded data before it touches production, so the old system keeps running unchanged.
How Does a Payment Gateway Reach Accounting?
A third-party API integration connects a payment gateway to accounting through one service in your cloud. It authenticates with keys from your vault and receives payment, refund and settlement events by webhook. It maps each field, retries failed calls and logs every call. The example below maps 38 fields; a CRM or carrier sync uses the same parts.
The Internet Engineering Task Force (IETF) standard for OAuth 2.0 (RFC 6749, 2012, Section 1) states: “In OAuth, the client requests access to resources controlled by the resource owner and hosted by the resource server, and is issued a different set of credentials than those of the resource owner.” That is why the integration signs in with API keys and OAuth secrets from your vault, not with a person’s login.
Payment gateway · events by webhook
The event’s path · its result in accounting
Payment
Payment event→Webhook received→Payment → invoice payment→Invoice paid
In your cloud
Keys from your vaultEvery call logged56 tests passing
Invoice paidpayment matched to its invoice
Refund
Refund event→Webhook received→Refund → credit note→Credit note
In your cloud
Keys from your vaultEvery call logged56 tests passing
Credit noteposted for each refund
Settlement
Settlement event→Webhook received→Settlement → bank deposit→Bank deposit
In your cloud
Keys from your vaultEvery call logged56 tests passing
Bank depositmatched to the settlement
Finance sign-off · a person signs
Production keys only after sign-off.
Field mapping38 fields · 6 failure cases listed
Retriesfailed calls retried; a dead-letter queue while a system is down
3
Days of sandbox data reconciled2 defects fixed before sign-off
Click an event, or a number below, to switch the result
After release: alerts on failed calls and vendor deprecation notices, 30 days of fixes, then optional Managed Ops.
Illustrative example. Yellow marks the step where a person signs; every field mapping is written down before code, and every call is logged.
How Do the Five Integration Steps Run?
Our API integration services run in five steps. A free scoping call leads to a two-week diagnostic that maps systems, fields, volumes and failure cases and quotes the pilot. A four-to-six-week pilot puts one integration live, tested and documented. Staged releases add the other connections, then Managed Ops follows. Each step ends with a result you can stop on.
01 30 min · free
Scope A call about the hand-off that costs the most re-keying and the systems on each side. If systems and volumes are known, you leave with a diagnostic quote.
02 2 weeks · credited
Diagnose Systems, fields, volumes and failure cases mapped; vendor API limits and sandboxes checked; the smallest useful integration defined; the pilot priced in writing.
03 4–6 weeks · fixed price
Pilot One integration built end to end: authentication, mapping, error handling and retries, automated tests against the sandbox, production deploy, monitoring and documentation.
04 Staged · quoted after pilot
Production The remaining connections and the integration layer in releases that go live one at a time, plus reconciliation reports, documentation and 30 days of fixes after each release.
05 Monthly · optional
Managed Ops Alerts, vendor change notices, version updates, re-tests and small changes, with a named engineer and a monthly review call. Cancel any month; everything stays yours.
Who Builds Your Integrations, and With What?
A named team you meet on the first call: integration engineers who write the code and tests, a QA lead who signs off sandbox test runs and releases, and a project manager who runs the demo every two weeks and keeps the shared channel and written change log current.
Platforms Any platform with a documented API, such as Salesforce, Stripe or QuickBooks
Connections Webhooks, queues, OAuth, retries and version pinning
Communication Demo every two weeks, shared channel, written change log
Delivery Git repositories, continuous integration, sandbox, staging and production
QA Automated sandbox tests, reconciliation checks and user acceptance sign-off
Hosting Your cloud accounts, your API keys, your monitoring
Which Integration Do You Actually Need?
One third-party API wired into your system is a single integration; two systems that must agree need a two-way sync. Four or more on one data model need an integration layer. An API you publish is custom API development, and a language model reading or writing the data is an AI integration instead. Five questions show which one fits.
The table compares the five verdicts the diagnostic can reach, when each applies and what it delivers.
| Integration type | When it applies | What it delivers |
|---|---|---|
| One third-party API | One vendor API wired into the system you already run | One pilot connects it end to end, tested against the vendor sandbox and documented |
| Two-way sync | Two systems that must agree, with two-way or event-driven data | Field mapping, ownership rules and conflict handling written down; webhooks with retries |
| Integration layer | Four or more systems on one data model | One middleware in your cloud that every system talks to, with data contracts and monitoring |
| Custom API development | Your own software needs an API for partners, customers or your app | A documented, versioned API in your cloud with keys, limits and logs |
| AI integration | A language model reads or writes the data | A separate service, scoped on the AI integration page |
Where two rows fit, the two-week diagnostic settles it and the pilot is scoped to the smallest useful integration.
1. What needs connecting?
2. Which way does the data move?
3. Does your own software need an API for others?
4. Is an AI model or large language model (LLM) part of it?
5. When must it be live?
Find Your Fit in Five Questions
Answer the five questions on the left and the verdict on the right changes to the integration type that fits: one third-party API, a two-way sync, an integration layer, custom API development, or an AI integration handled as a separate service. The verdict is a first estimate; the two-week diagnostic confirms it against your systems, fields and volumes.
One Third-Party API, Connected and Documented
A payment gateway, a shipping carrier, a maps API wired into the system you already run: one pilot connects it end to end, tested against the vendor sandbox, in four to six weeks. Keys stay in your vault, every call is logged, and the documentation is handed over with the code.
A first estimate; the diagnostic confirms it.
How the verdict is decided
A language model reads or writes the data → an AI integration, a separate service
Four or more systems → an integration layer
Your software needs its own API → custom API development
Two systems, or two-way or event-driven data → a two-way sync
Everything else → one third-party API, connected and documented
Why Choose Us as Your API Integration Company?
An API integration company is judged on connections still running, unattended, two years later, not on the logos on its slide. We deliver custom system integration in staged releases, priced in writing and run in your cloud. Personal data that flows through an integration is handled under Article 28 of the General Data Protection Regulation (GDPR) (Regulation (EU) 2016/679, 2016).
Without a Staged Process
!!!!!
- A point-to-point script that only its author understands
- Live keys used for testing, and nobody told finance
- Hourly billing that grows every time a vendor changes its API
- Integration code held in a vendor repository you lose at contract end
With Eicra Soft Limited
Pilot report · Gateway → accounting
Fields mapped38Tests56Days reconciled3Open defects0VerdictReleased
Illustrative example
- A named team, a demo every two weeks, data flowing on sandbox
- Each step at a fixed price; production quoted in writing after the pilot
- Code, keys, tests and documentation in your accounts from the first commit
- Reconciliation signed off by your finance or operations team before release
Is It Safe to Outsource API Integration?
Outsourcing API integration offshore is safe when credentials, access and data handling are settled in writing before work starts. As a Bangladesh-based company, we sign a data processing agreement (DPA) and a non-disclosure agreement (NDA) first. We work in your repositories and cloud, never store your API keys, and hand back credentials at handover. Reviewed by Asma Sultana Minu
The Open Worldwide Application Security Project (OWASP) API Security Top 10 (OWASP, 2023, Foreword) states: “By nature, APIs expose application logic and sensitive data such as Personally Identifiable Information (PII) and because of this, APIs have increasingly become a target for attackers.” That is why keys stay in your vault and every integration is tested in the vendor sandbox first.
Which Agreements Are Signed, and When?
NDA — mutual, signed before any credential, API documentation or data sample is shared with anyone.
DPA — Article 28(3) processor terms under the GDPR, with the national equivalent, for personal data passing through an integration.
International data transfers — standard contractual clauses, or whatever instrument your jurisdiction asks for, in place before personal data flows.
Access — least-privilege roles in your repositories and cloud; API keys and OAuth secrets live in your vault alone.
Certifications — this page and our proposals claim none; one appears only once it is held.
Controls, Ownership and Rework Terms
Your accounts Vendor developer accounts, keys, pipelines and monitoring are created in your name from day one; nothing is hosted on our side.
Code ownership All intellectual property (IP) is assigned to you in the contract; third-party libraries are listed, and none are copyleft without your sign-off.
Reviews Every change goes through a pull request, an automated test run against the sandbox and a second engineer’s review before staging.
Sandbox first No integration touches live data until it has passed its test suite in the vendor sandbox and a reconciliation check signed by your team.
Rework No charge to fix a release that fails its agreed acceptance tests; new connections are priced first as a change request.
What Proof Comes Before You Pay?
Before you pay for third-party API integration, you watch data move in the sandbox. Three commitments are measured below, and the pilot puts one integration live before production is quoted. Scoping takes one free 30-minute call. Client results with names follow once clients sign off.
30 minutesA free call on the hand-off that costs the most re-keying; if systems and volumes are known, you leave with a quote.
4–6 weeksTo the first integration running live, tested against the vendor sandbox and documented.
30 daysOf fixes after each production release, with reconciliation reports and documentation.
Case studies: client names and numbers appear here only with each client’s permission. On the scoping call, ask for references in your sector.
What Do Buyers Ask About Third-Party API Integration?
Buyers ask a third-party API integration company five questions before they start: the cost, what the work is with examples, the best practices, how long it takes, and who owns the code and keys. Each answer below uses the prices, steps and controls on this page.
How much does API integration cost?
Third-party API integration with us is priced per result, not per hour. The cards at the top show each price: the two-week diagnostic, half of which is credited to the pilot; the fixed-price pilot for one integration; and production, quoted after the pilot.
What is third-party API integration?
Third-party API integration connects your systems to an API another company publishes. Examples include the Stripe payments API, the Salesforce API and the QuickBooks Online Accounting API. Custom API development builds your own API instead, so partners and your web applications can read and write your data safely.
What are API integration best practices?
We apply five best practices on every third-party API integration: sandbox tests before live data, keys and OAuth secrets in your vault, rate limits checked before quoting, retries with dead-letter handling, and version pinning with logs and alerts. A failed call then shows up before your staff miss any data.
How long does an API integration take?
A first integration is live in six to eight weeks: a two-week diagnostic that maps systems, fields and rules, then a four-to-six-week pilot that connects one API, tested in the vendor sandbox and documented. Later connections follow in stages, so the first sync runs while the next is built.
Who owns the code, keys and documentation?
You do, all three. Keys, OAuth secrets and credentials stay in your vault, and our team never stores them. The code, tests and documentation live in your repositories from the first commit, ownership is written into the contract, and a data processing agreement is signed before personal data flows.
Start with a free 30-minute scoping call or the two-week diagnostic.