How Vervali Load Tests Shopify Stores Before Black Friday
How Vervali load tests Shopify and Shopify Plus stores before Black Friday: the Shopify rules, what gets tested, when to start and what it costs.
Functional API Testing Services:
REST and GraphQL
Vervali tests REST and GraphQL APIs for request, response, error path and workflow, in CI/CD, with Postman and REST Assured. Every engagement ends with coverage your developers can rerun and a clear list of what fails, so the integration your customer depends on is proven before it goes live. The full API pack, including contract, security and load, is on API testing services.
150+ clients
450+ projects
275+ engineers
15+ years
ISO/IEC 17025:2017Accredited testing laboratory
CMMI Maturity Level 3The process is written down and repeats
ISO 9001:2015Quality management
ISO/IEC 27001Information security
Request, Response, Error Path and Workflow, in the Pipeline
REST and GraphQL, tested where integrations actually break, not only on the documented 200.
Request and Response
The documented behaviour: methods, status codes, payloads and the data the caller needs. A 200 with the wrong object is a fail.
Error Paths
What the caller gets when something upstream fails: timeouts, 4xx, 5xx and partial payloads. Integrations break here, not on the happy path.
Workflow Sequences
The sequence a real journey hits, with state carried between calls, so a break in step three shows up before production does.
REST APIs
Resources, methods and status codes checked against the documented behaviour, including the data the consumer actually needs and the case where a field is missing.
GraphQL APIs
Queries, mutations and what the caller gets when a resolver fails. We do not treat a REST collection as a GraphQL pass.
Expected Bodies Agreed First
We write the expected body with your API owner before execution, so a blank 500 is never accepted as a contract.
Need error-path and workflow coverage, not another happy-path collection?
Free API AuditTools and Pipeline
Named, because you will scan for them: where the suite is written and where it runs.
Postman
Collections for exploration and a first audit, easy for your developers to read, rerun and extend after we hand the suite over.
REST Assured
Used when the suite has to live in a Java build, next to the service code it tests, so it runs with every build.
CI/CD
GitHub Actions, Jenkins or Azure DevOps, whichever you already run. Pull requests get the fast functional set, and a laptop-only run is not the engagement.
The Layers Next Door
Functional testing is one layer of the full API pack. Take it alone or together.
The Full API Pack
Functional, contract, auth, error, rate limits, security and load in one engagement, with one report and one owner on our side. See API testing services.
API Test Automation
How the suite keeps running after every commit, with a flake budget and an owner for every fail. See API test automation.
API Security Testing
The OWASP API Top 10 slice, run on agreed in-scope endpoints and kept separate from functional work. See API security testing.
API Development
Building the API itself, with contract, security and load tests shipping alongside it, written by the same QA team. See API development.
Already have the endpoint list? A QA lead can scope the pack.
Book a CallProof From Delivery
ERP, payments and identity integrations delivered in enterprise and fintech engagements. They were not functional-API-only jobs.
India · two leading private-sector banks
Loan processing and onboarding depended on the integrations behind the screens. After the pack ran: 60% faster loan processing, 50% less agent onboarding time, and 100% compliance on the controls named in that work.
60% faster loan processing 50% less agent onboarding timeIndia · manufacturer · sales-operations platform
40% less manual stock reconciliation when the old record and the new process finally agreed. Request, response and error-path checks are how you see the break before cutover.
40% less manual stock reconciliationUAE · SME finance platform
Automation on repeatable finance journeys, including the APIs those journeys call. After: 40% less testing time, and 98% user satisfaction. Identity and payment integrations stay unnamed.
40% less testing time 98% user satisfactionHow an Engagement Starts
From one audited service to a suite that fails the right build.
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01
Share the Endpoints
Tell us the endpoints, the journeys they serve and any existing collections, with staging access under NDA.
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02
Get the Pack
The coverage model: request, response, error path and workflow on the APIs you named, in the tools you already use.
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03
Start With One Service
A free API audit of one service shows the surface before anyone writes a quote. Most engagements land at $25 to $49 an hour blended, and price follows endpoints and roles.
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04
Run It in the Pipeline
Suites run on pull requests and nightly, 9am to 1pm Eastern with delivery from India.
Frequently Asked Questions
Functional testing covers request, response, error path and workflow for REST and GraphQL, in Postman and REST Assured, inside CI/CD. A UI pass does not prove the API, and a 200 with the wrong object is a fail. The full pack is on API testing services.
It checks that the services behind a product still agree. The functional layer covers methods, status codes, payloads, error paths and the sequence a real journey hits. A consumer that mocks the provider can stay green while production breaks. A free API audit of one service is the first look.
Functional request, response, error path and workflow, across REST and GraphQL. Contract, authentication, rate limits, security and load are in the full pack on API testing services, and each layer can be bought on its own. API test automation and API security testing are also available separately.
Postman for exploration and collections, and REST Assured for Java suites. Pipelines are GitHub Actions, Jenkins or Azure DevOps, whichever you already run. Any extra tool you want is named in the quote. A free API audit shows which of these already exist in your team.
It is a test that fails the provider or the consumer when they no longer agree, before production. You need it when two teams ship on different clocks and the consumer still mocks the provider. That pack is on API testing services, and we say so in the review.
Yes, when GraphQL is named in the quote. We test queries, mutations and what the caller gets when a resolver fails. Schema compatibility and field authorisation are in the full pack, and REST is covered in the same engagement when it is also in scope. A free API audit is the first look.
Yes. GitHub Actions, Jenkins or Azure DevOps, whichever pipeline you already have. Pull requests get the fast functional and smoke set, and nightly gets the wider pack. A laptop-only run is not the engagement. Reports land in a form developers can act on.
Most engagements land at $25 to $49 an hour blended. Price follows endpoints and roles, whether error paths and workflow sit in the same week, and whether the suite is handed over or maintained. A free API audit of one service shows the surface before anyone writes a quote.
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