Payment Gateway Technology
check Payment Verified
secure SSL Secured
card Multiple Gateways
Card Payment Gateway Solutions

Seamless Online Payments,
All in One Place

Comprehensive payment gateway services—from registration and setup to API integration training. Designed to scale with businesses of all sizes securely.

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6+
Leading Gateways
24h
Rapid Integration
100%
Bank-Grade Security
01 — REGISTRATION SERVICE

Payment Gateway Setup
Done Right

We help you register accounts with leading Payment Gateways, handling document preparation, identity verification, and full account setup so you can start accepting payments faster.

POPULAR
PayPal
Global Payments
Stripe
Developer Friendly
TH
Omise (Opn)
PromptPay Support
2C2P
Southeast Asia
GB Prime Pay
Local Thai SME
Wise
Forex Friendly

Not Sure Where To Start?

Our payment experts will analyze your business model and recommend the most cost-effective gateway for your needs.

Get a Free Consultation
02 — Installation Service

Install Bank Transfer
& QR Code on Your Website

Set up a seamless payment experience via automated bank transfers and dynamic QR codes, fully integrated with your backend operations.

Bank

Bank Transfer API

Automate your bank transfer payments with real-time transaction verification system.

  • check Integrate Banking APIs from leading banks
  • check Real-time payment notification system
  • check Automated receipt generation upon success
  • check Supports all major Thai banks
  • check Centralized payment tracking dashboard
QR Code

Dynamic QR Code

Install PromptPay and Bank QR Codes, supporting direct scans from all banking applications.

  • check BOT-standard PromptPay QR integration
  • check Dynamic QR Codes (unique order amounts)
  • check Supports SCB, KBANK, BBL, KTB, TTB, etc.
  • check Customizable QR expiration logic
  • check Instant payment verification via Webhook

Supported Thai Banks

SCB
KBANK
BBL
KTB
TTB
BAY
KKP
PromptPay
Settings

Installation Process

1

System Analysis

We examine your website’s platform and tech stack.

2

Flow Design

Design an optimized payment user journey.

3

API Integration

Seamlessly integrate APIs into your backend.

4

Sandbox Testing

Comprehensive tests to ensure flawless operation.

5

Go Live

Launch securely with dedicated post-support.

03 — Training Services

End-to-End Payment
Gateway Training

Our curriculum covers everything from initial registration to successfully deploying the API in your real-world production environment.

Phase 1 — Registration
Create a PayPal Business Account
Create a business account, verify identity, link bank accounts, and set up your profile for receiving global payments securely.
KYCBusiness VerificationBank Link
Phase 2 — API Setup
Create App & Get Client Credentials
Access the PayPal Developer Portal, create an app, and retrieve your Sandbox and Production Client IDs.
Developer PortalOAuth 2.0Sandbox
// Create PayPal Order const order = await paypal.createOrder({ intent: “CAPTURE”, purchase_units: [{ amount: { currency_code: “USD”, value: “100.00” } }] });
Phase 3 — Integration
Install PayPal SDK on Website
Implement the PayPal JS SDK to render Smart Payment Buttons, handle webhooks, and securely capture payments.
JS SDKSmart ButtonsWebhooks
Phase 4 — Testing & Go Live
Test in Sandbox & Deploy
Test all success and failure scenarios in Sandbox, swap credentials to Production, and officially Go Live!
Sandbox TestingProduction SwitchGo Live
Phase 1 — Registration
Register Stripe Account & KYC
Sign up for Stripe, undergo identity verification, submit business details, and get your account approved.
Business InfoIdentity Verification
Phase 2 — API Keys
Get Publishable & Secret Keys
Navigate the Stripe Dashboard to retrieve your unique API Keys for both Test and Live environments.
API KeysStripe Dashboard
// Create Payment Intent const intent = await stripe.paymentIntents.create({ amount: 10000, // Amount in satangs/cents currency: ‘thb’, payment_method_types: [‘card’] });
Phase 3 — Integration
Implement Stripe Elements
Use Stripe Elements or Checkout Sessions to build a seamless and highly secure payment flow on your frontend.
ElementsCheckout3DS
Phase 4 — Webhook & Live
Set up Webhooks & Go Live
Configure Webhook endpoints to listen for events like `payment_intent.succeeded` before going live.
WebhooksEvent ListeningLive Mode
Phase 1 — Registration
Register for Omise (Opn Payments)
Sign up for an Omise account, submit necessary Thai business documents, and await verification.
Opn PaymentsThailandBusiness Verify
Phase 2 — API Integration
Integrate Cards & PromptPay
Use the Omise API to securely tokenize cards and generate sources for PromptPay QR codes.
Card TokenPromptPayTrueMoney
// Create Charge with Omise Omise.createToken(‘card’, cardData, (statusCode, resp) => { // Send resp.id to your backend to create a charge });
Phase 3 — Testing & Go Live
Test Flows and Deploy
Simulate successful and failed transactions using test cards, then update to Live Keys.
Test CardsLive Keys
Phase 1 — Registration
Register 2C2P Merchant Account
Submit corporate documents to obtain an approved Merchant ID for processing in Southeast Asia.
Merchant IDDocument Submission
Phase 2 — Payment Page
Implement 2C2P Payment Page & API
Transmit order data via Hash Signatures/JWT to ensure payload integrity.
Payment PageHMACJWT
Phase 3 — Go Live
Go Live on Production
Complete integration testing, switch to the production endpoint, and monitor IPN Callbacks.
ProductionIPN Callback
Phase 1 — Registration
Register Pay Solution
Complete the Thai KYC process and receive your Merchant Account specifically for local payments.
Thai MerchantKYC
Phase 2 — Integration
Integrate Cards & QR Code
Connect the API to open transactions for Credit/Debit cards, Installments, and PromptPay.
Credit CardPromptPay QRInstallment
Phase 3 — Go Live
Test & Deploy
Verify data passing in the UAT environment, then push to your Production Server.
UAT TestingProduction Deploy
Phase 1 — Registration
Register Wise Business Account
Create your account, undergo identity verification, and activate multi-currency features.
Multi-CurrencyInternational Transfers
Phase 2 — API Setup
Automate with Wise Platform API
Utilize the Wise API to automate Quotes, set up Transfers, and handle account funding.
Transfers APIQuotesWebhooks
// Create Transfer Quote POST /v3/profiles/{profileId}/quotes { “sourceCurrency”: “THB”, “targetCurrency”: “USD”, “sourceAmount”: 50000 }
Phase 3 — Production
Deploy in Production
Confirm API behaviors in Sandbox mode before switching over to Live API Keys.
Sandbox EnvironmentLive Keys
1-on-1 Training

1-on-1 Training

Learn directly with our tech experts at your convenience via Zoom or on-site sessions.

Documentation

Provided Documentation

Receive comprehensive step-by-step guides and code samples for future reference.

Hands-on

Hands-on Practice

Test your integrations on actual Sandbox environments while debugging in real-time.

04 — Packages

Choose Your
Perfect Plan

Clear pricing with no hidden fees. Contact us for a customized quote based on your exact project scope.

Starter
Contact Us
For Starter Websites
Ideal for businesses looking to add their first Payment Gateway.
  • Register 1 Gateway
  • Website Payment Installation
  • Sandbox Testing
  • 30 Days Post-Installation Support
  • Guideline Documentation
Get Started
🔥 Recommended
Professional
Contact Us
For Growing Businesses
Comprehensive service: Registration, Installation, and End-to-End API Training.
  • Register up to 3 Gateways
  • Install Bank Transfer + QR Code
  • 1-on-1 API Training
  • Code Samples for Every Gateway
  • 90 Days Post-Installation Support
  • Live Production Setup
Choose This Plan
Enterprise
Custom
For Organizations
Tailored packages designed to meet all your enterprise requirements.
  • Unlimited Gateways
  • Custom Integration Architecture
  • Team Training Workshop
  • Lifetime Priority Support
  • SLA with Uptime Guarantee
  • Dedicated Project Manager
Consult Our Team

Frequently Asked Questions

Not at all! We provide a Full Service that takes care of everything from registration to complete installation on your platform. However, if you want your team to learn how to manage or deploy it in the future, we also offer 1-on-1 API training services.

It heavily depends on your platform’s architecture and the number of gateways required. Generally, integrating a single gateway takes about 1-3 business days. If you have an urgent timeline, please consult with our team.

We support a wide range of platforms including WordPress / WooCommerce, Laravel, Node.js, React, Next.js, and Custom PHP. Our developers can adapt the API integration to almost any modern tech stack.

Yes, absolutely! All our packages include post-installation support. Our Professional and Enterprise tiers come with extended long-term support, ensuring we are always available to answer your technical questions via LINE and Email.

Transaction fees are charged directly by the respective payment gateway providers (for example, Stripe is approximately 2.9% + 30¢, and Omise is ~3.65% for cards). Our consultants will recommend the most cost-effective gateway based on your specific transaction volume and business model.

Definitely! Using multiple gateways allows your customers to choose their preferred payment method, reducing cart abandonment. We can design and implement a custom Payment Router specifically tailored to fit your checkout flow.

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Ready to Scale Your Payments?

Start using Onsello’s Payment Gateway solutions for your business today. Accept multiple payment methods, reduce transaction fees, and manage all your revenue streams securely in one centralized platform.

Phone +66(0) 612 748 444 Email marketing@onsello.com LINE LINE: @onsello

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Transparent Pricing
20+ Payment Methods
Secure & PCI-Compliant