API Integration Services
ClickMasters integrates third-party APIs into B2B products across the USA, Europe, Canada, and Australia. Stripe for payments, subscriptions, and marketplace payouts. Twilio for SMS, voice, and WhatsApp. SendGrid for transactional and marketing email. Salesforce, HubSpot, and Pipedrive CRM integration. Google Maps, Calendar, and Workspace. OAuth 2.0 social login. Webhook consumer infrastructure. Any REST or GraphQL API your product depends on.
Years Experience
Projects Delivered
Client Satisfaction
Support Available
High-Demand API Integrations
- Stripe: Payments, subscriptions, marketplace payouts. Key considerations: PCI scope reduction via Stripe.js (card data never touches your server), idempotency keys on all charge requests, webhook signature verification, SCA/3DS compliance, test mode validation before live.
- Twilio: SMS, voice, WhatsApp. Key considerations: rate limits per phone number, A2P 10DLC registration for US SMS campaigns (legal compliance), webhook for delivery status, phone number provisioning and management.
- SendGrid/Postmark: Transactional email. Key considerations: DKIM/SPF/DMARC setup for deliverability, suppression list management, bounce webhook handling, transactional vs marketing stream separation.
- Salesforce: REST API CRUD, SOQL query, Apex triggers, Change Data Capture. Key considerations: API version management (Salesforce updates twice yearly), governor limits (API call limits per 24h), OAuth 2.0 Connected App setup, sandbox testing before production.
- HubSpot: Contacts, Companies, Deals API, webhooks, Custom Properties. Key considerations: rate limits (100 calls/10s), Private App vs OAuth App, webhook subscriptions for real-time sync, custom object API for non-standard data.
- Google APIs: Maps, Calendar, Workspace. Key considerations: OAuth 2.0 scope minimisation, API quota management, Service Account for server-to-server, Google Cloud Console API key management.
OAuth 2.0 Security Best Practices
OAuth 2.0 Authorization Code with PKCE is the correct implementation for web and mobile applications. Security requirements: PKCE (Proof Key for Code Exchange prevents authorisation code interception attacks), state parameter (CSRF protection), HttpOnly cookie for token storage (not localStorage prevents XSS theft), and refresh token rotation (each refresh generates new refresh token, invalidating the old one). ClickMasters implements all four security mechanisms as standard on every OAuth 2.0 integration.
API Integration Services We Deliver
ClickMasters operates as a full-stack api integration partner. Our team handles every layer of the software delivery lifecycle — product strategy, UI/UX design, backend engineering, cloud infrastructure, QA, and ongoing support.
Payment API (Stripe)
Stripe integration: Charges (PaymentIntents), Subscriptions (recurring billing, customer portal, prorations), Stripe Connect (marketplace payouts), webhook consumer (payment events succeeded, failed, refunded, dispute), SCA/3DS compliance, Idempotency keys on all charge requests, PCI scope reduction via Stripe.js (card data never touches your server).
Communications API (Twilio)
Twilio integration: SMS (Programmable Messaging), Voice (Programmable Voice IVR, call routing, recording), WhatsApp Business API, Verify (OTP verification), Conversations (multi-channel messaging). Rate limits per phone number, A2P 10DLC registration for US SMS campaigns, webhook for delivery status.
Email API (SendGrid/Postmark)
Email integration: Transactional email (order confirmations, password reset, notifications), dynamic templates, bounce/unsubscribe handling, email analytics (open rate, click rate, delivery). DKIM/SPF/DMARC setup for deliverability, suppression list management, transactional vs marketing stream separation.
CRM Integration (Salesforce/HubSpot)
CRM integration: REST API CRUD (create/update/delete records), SOQL query (search Salesforce objects), webhook subscriptions for real-time sync, Change Data Capture (stream record changes), OAuth 2.0 Connected App setup. HubSpot: Contacts, Companies, Deals API, Private App vs OAuth App, Custom Properties, Workflows triggered by API events.
OAuth 2.0 / Social Login
OAuth 2.0 integration: Social login (Google, GitHub, Microsoft, Apple Sign In), enterprise SSO (Azure AD, Okta, Ping Identity via OIDC), OAuth 2.0 Authorization Code with PKCE (secure mobile and SPA flows), token storage (HttpOnly cookie no localStorage). Security: PKCE (prevents code interception), state parameter (CSRF protection), refresh token rotation.
Webhook Consumer Infrastructure
Build infrastructure to receive and process webhooks: signature verification (validate HMAC signature reject unsigned/invalid requests), idempotency (deduplicate webhook events same event may be delivered multiple times), async processing (immediately return 200, process in background queue prevent timeout), retry handling (design consumer to be idempotent, services retry on non-2xx).
Why Companies Choose ClickMasters
Stripe, Twilio, SendGrid, Salesforce, HubSpot, Google, OAuth, Webhooks each with key considerations
Basic: Generic "we integrate APIs" (no specifics)
Stripe.js card data never touches your server, PCI SAQ A
Basic: Custom payment form (PCI SAQ D-expensive)
US SMS campaign registration legal compliance for Twilio messaging
Basic: No registration (delivery issues, blocks)
Email deliverability authentication prevents spoofing, improves inbox placement
Basic: No authentication (goes to spam)
OAuth 2.0 security prevents code interception, CSRF, XSS token theft
Basic: Implicit flow (deprecated, insecure)
Our API Integration Process
A proven methodology that transforms your vision into reality
API Integration Scoping
API selection, auth flow design (OAuth vs API key), error handling strategy, rate limit analysis, cost model. Deliverable: API Integration Spec + Cost Estimate.
Authentication & API Client
OAuth setup (client ID/secret, redirect URIs, token exchange), API client with retry logic (exponential backoff), timeout configuration, error handling, logging. Deliverable: API Client + Auth.
Endpoint Implementation
Implement required API endpoints (CRUD operations, search, batch), data transformation (field mapping, schema conversion), response validation, webhook consumer (signature verification, idempotency, async processing queue). Deliverable: Production API Integration.
Rate Limit & Cost Management
Rate limit header inspection (X-RateLimit-Remaining), exponential backoff with jitter (on 429), request queuing (BullMQ rate limiter), request batching (Salesforce Bulk API, HubSpot Batch API), cost monitoring dashboard. Deliverable: Rate Limit Handling + Dashboard.
API Integration Scoping
API selection, auth flow design (OAuth vs API key), error handling strategy, rate limit analysis, cost model. Deliverable: API Integration Spec + Cost Estimate.
Authentication & API Client
OAuth setup (client ID/secret, redirect URIs, token exchange), API client with retry logic (exponential backoff), timeout configuration, error handling, logging. Deliverable: API Client + Auth.
Rate Limit & Cost Management
Rate limit header inspection (X-RateLimit-Remaining), exponential backoff with jitter (on 429), request queuing (BullMQ rate limiter), request batching (Salesforce Bulk API, HubSpot Batch API), cost monitoring dashboard. Deliverable: Rate Limit Handling + Dashboard.
Endpoint Implementation
Implement required API endpoints (CRUD operations, search, batch), data transformation (field mapping, schema conversion), response validation, webhook consumer (signature verification, idempotency, async processing queue). Deliverable: Production API Integration.
Technology Stack
Modern tools we use to build scalable, secure applications.
Languages
APIs & Integration
Cloud & DevOps
Industry-Specific Expertise
Deep expertise across various sectors with tailored solutions
Stripe Payment Integration
Twilio SMS Verification
Salesforce to Stripe Sync
Google OAuth Social Login
API Integration Development Pricing
Transparent pricing tailored to your business needs
API Integration Scoping
Perfect for businesses that need api integration scoping solutions
Package Includes:
- Timeline: 1 week
- Best For: API selection, auth flow design, error strategy, cost model
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Payment API (Stripe)
Perfect for businesses that need payment api (stripe) solutions
Package Includes:
- Timeline: 2 - 4 weeks
- Best For: Charges/subscriptions/Connect, webhooks, PCI scope, testing
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Communications API (Twilio)
Perfect for businesses that need communications api (twilio) solutions
Package Includes:
- Timeline: 2 - 3 weeks
- Best For: SMS/Voice/WhatsApp, templates, delivery webhooks, 10DLC
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Email API (SendGrid/Postmark)
Perfect for businesses that need email api (sendgrid/postmark) solutions
Package Includes:
- Timeline: 1 - 3 weeks
- Best For: Templates, webhooks, DKIM/SPF/DMARC, suppression, analytics
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
CRM Integration (Salesforce/HubSpot)
Perfect for businesses that need crm integration (salesforce/hubspot) solutions
Package Includes:
- Timeline: 2 - 5 weeks
- Best For: CRUD, webhooks, field mapping, sync strategy, error handling
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
OAuth 2.0 / Social Login
Perfect for businesses that need oauth 2.0 / social login solutions
Package Includes:
- Timeline: 2 - 3 weeks
- Best For: Provider setup, PKCE, token storage, refresh rotation
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Webhook Consumer Infrastructure
Perfect for businesses that need webhook consumer infrastructure solutions
Package Includes:
- Timeline: 2 - 3 weeks
- Best For: Signature verification, idempotency, async queue, DLQ, monitoring
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Multi-API Integration Suite
Perfect for businesses that need multi-api integration suite solutions
Package Includes:
- Timeline: 4 - 8 weeks
- Best For: Multiple third-party APIs, shared error handling, monitoring dashboard
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
* All prices are estimates and may vary based on specific requirements. Contact us for a detailed quote.
CEO Vision
To build scalable, intelligent custom software development solutions that empower businesses to grow, automate, and transform in a digital-first world.
We are not building software. We are architecting the infrastructure of tomorrow — systems that think, adapt, and grow alongside the businesses they power. Our mission is to make cutting-edge technology accessible to every ambitious team on the planet.
Amjad Khan
CEO
12+
Years
300+
Projects
98%
Retention
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