3rd Party API Integration
Third-party API integration services connect the software your business already runs: the payment gateway, the customer relationship management (CRM) platform, the accounting or enterprise resource planning (ERP) system, the shipping carrier, the shop. We read each vendor’s application programming interface (API) documentation, map the fields and rules, write and test the integration code, and document it. As a Dhaka-based company, we deploy it in your own cloud, for international companies, at a fixed price per step, with integration engineers and a quality assurance (QA) lead who test every connection against the vendor sandbox before it touches your live data.
One exit at each step. No long-term commitment at any of them. 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 nothing justifies a build, you stop here.
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 is included in third-party API integration services?
Third-party API integration is the work of connecting the software you run to the APIs other vendors publish, and 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.
CRM integration
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.
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.
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.
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.
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.
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 enterprise system integration, not only single APIs?
Yes, enterprise system integration is the wider job: four or more systems, one data model, one integration layer in the middle with monitoring, so finance, sales, operations and the warehouse 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 is added.
Integration layer
One middleware or service in your cloud that every system talks to, instead of point-to-point links nobody can map.
Data contracts and mapping
Which system owns each field, how values are translated, and what happens on conflict, written down before code.
Event-driven sync
Webhooks and queues that move changes as they happen, with retries and dead-letter handling when a system is down.
Legacy system connectors
Adapters for the old custom software you still run, so it joins the integration layer without a rewrite.
How does a third-party API integration connect a payment gateway to 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, receives payment, refund and settlement events by webhook, maps each field, retries failed calls and logs every call. The example below maps 38 fields; a CRM sync or a carrier integration uses the same parts.
Payment gateway · vendor API
SandboxProduction keys after sign-off
Paymentcheckout completed
Refundissued to a customer
Settlementpayout sent to your bank
Each event is sent by webhook as it happens
Integration service · in your cloud
AuthenticationAPI keys and OAuth secrets read from your vault
Webhookspayment, refund and settlement events received
Retriesfailed calls retried; a dead-letter queue while a system is down
Logs and testsevery call logged · 56 automated tests passing
Field mapping38 fields · 6 failure cases listed
Payment→Invoice payment
Refund→Credit note
Settlement→Bank deposit
Accounting platform
Invoice paidpayment matched to its invoice
Credit noteposted for each refund
Bank depositmatched to the settlement
Finance sign-off · a person signs3 days of sandbox data reconciled · 2 defects fixed
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 API integration services work, from scope to Managed Ops?
API integration services with us run in five steps: a free scoping call, a two-week diagnostic that maps systems, fields, volumes and failure cases and quotes the pilot, a four-to-six-week pilot that puts one integration live, tested and documented, staged releases for the remaining connections, then Managed Ops. Every step ends with a written 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 demos.
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 need: one API, a two-way sync, an integration layer, or your own API?
One third-party API wired into a system you run is a single integration; two systems that must agree is a two-way sync; four or more on one data model is an integration layer; an API you publish is custom API development; a language model reading or writing the data is an AI integration instead. Five questions show which one fits.
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?
Which one do you need? Answer five questions.
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.
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 that are still running, unattended, two years later, not on the logos on its slide. We deliver custom system integration in staged releases, priced in writing, in your cloud, with personal data that flows through an integration handled under Article 28 of the General Data Protection Regulation (GDPR).
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
- Code in the vendor’s repository you cannot reach after the contract
With EICRA
Pilot report · Gateway → accounting
Fields mapped38Tests56Days reconciled3Open defects0VerdictReleased
Illustrative example
- A named team, a demo every two weeks, data flowing on sandbox
- Fixed prices at every step; 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 to an offshore team is safe when credentials, access and data handling are settled in writing before work starts. As a Bangladesh-based company, we sign a non-disclosure agreement (NDA) and a data processing agreement (DPA), work in your repositories and cloud, never store your API keys, and hand back credentials at handover. Reviewed By Eicra.com team
Which API integration agreements are signed, and when?
NDA — mutual, signed before any credential, API documentation or data sample is shared with anyone.
DPA — processor terms under Article 28(3) of the GDPR and the equivalent national law, for any personal data that flows through an integration.
International data transfers — standard contractual clauses or the transfer instrument your jurisdiction requires, signed before personal data moves.
Access — least-privilege roles in your repositories and cloud; API keys and OAuth secrets stay in your vault, never in ours.
Certifications — listed only when held; none are claimed on this page or in any proposal.
What API integration controls, ownership and rework terms apply?
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 Free when a release fails its agreed acceptance tests; new scope is priced first as a change request.
What proof do you get before you pay for third-party API integration?
Before you pay for third-party API integration, you get evidence instead of promises: measured commitments, a pilot that puts one integration live before production is quoted, and a free 30-minute scoping call. Client case studies with numbers are added here as clients give permission to name them.
30 minutes
A 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 weeks
To the first integration running live, tested against the vendor sandbox and documented.
30 days
Of fixes after each production release, with reconciliation reports and documentation.
Case studies: client results with numbers are added here as clients give permission to name them. Ask on the scoping call for references in your industry.
What do buyers ask about third-party API integration?
How much do third-party API integration services cost?
Our third-party API integration services are priced per outcome, not per hour, and each price is on the price cards at the top: a two-week diagnostic ending in a written verdict and a pilot quote, half credited to the pilot; a pilot that puts one integration live, tested and documented; then production, quoted after the pilot.
What is third-party API integration, and what are some examples?
Third-party API integration connects your systems to an API someone else publishes: a payment gateway, a CRM, a shipping carrier, an accounting platform. Custom API development builds your own API so partners, customers or your web and mobile apps can read and write your data safely. Most projects need the first; growing products need both.
What are the best practices for third-party API integration?
We apply five third-party API integration best practices on every project: vendor sandbox tests before live data; keys and OAuth secrets kept in your vault; rate limits and authentication checked before quoting; retries with dead-letter handling when a system is down; and version pinning, logging and alerts, so a failed call shows up before your staff notice missing data.
How long does a third-party 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 end to end, tested against the vendor sandbox, deployed and documented. Further connections and a full integration layer are released in stages, so the first sync is running while the next is built.
Who owns the integration code, the API keys and the documentation?
You do, all three. API keys, OAuth secrets and credentials stay in your vault and your accounts; our offshore team works through least-privilege access and never stores them. The integration 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 any personal data flows.
Start with a free 30-minute scoping call or the two-week diagnostic.