The verdict in three sentences
Integrating a payment gateway on a Singapore B2B website costs SGD 3,500 to 8,500 in 2026, plus a transaction fee of 1.5 to 3.4% depending on the provider and payment method. The critical path is often not development but merchant account onboarding and compliance checks, which take 1 to 4 weeks. Combined with automatic GST-compliant invoicing, the integration speeds up collections by about 40% for a company selling registrations to businesses.
The needs of a B2B training provider
The CFO of a corporate training provider in Singapore sells 2 to 5 day sessions to companies: leadership, advanced Excel, workplace safety, compliance. Today the client receives a quote, returns a purchase order, waits for a pro forma invoice and then pays by bank transfer. Between registration and payment, 25 to 45 days pass, and 12% of reserved seats are never paid.
The goal: an HR manager can register three employees online, pay by local or international card with 3D Secure, or by PayNow, and immediately receive an invoice showing the UEN, GST registration number and 9% GST. Bank transfer remains available for large accounts, with a 7-day provisional booking.
| Item | Scope | 2026 cost (SGD excl. GST) | Lead time |
|---|---|---|---|
| Merchant account | Onboarding, KYC, website review | Usually no setup fee | 1 to 4 weeks |
| Gateway integration | Hosted checkout, payment return, server webhooks | 1,700 to 3,500 | 2 to 3 weeks |
| B2B registration flow | Multi-participant cart, company details, UEN | 850 to 2,100 | 2 weeks |
| Automatic invoicing | Sequential numbering, UEN, 9% GST, PDF emailed | 700 to 1,700 | 1 to 2 weeks |
| Accounting reconciliation | Transaction export to accounting software | 300 to 1,100 | 1 week |
| Testing and go-live | Card tests, 3D Secure, refunds | Included or 400 | 1 week |
| Total | Full integration | 3,500 to 8,500 | 6 to 10 weeks |
Fees and payment options compared
In Singapore, a single gateway usually covers local cards, international cards and PayNow QR. For a training provider whose clients are 90% Singapore companies, PayNow and corporate cards cover most needs, with bank transfer for large accounts.
| Option | Methods accepted | Indicative fee | Payout delay | B2B relevance in Singapore |
|---|---|---|---|---|
| International gateway | Visa, Mastercard, Amex, wallets | 3.4% + SGD 0.50 | T+2 to T+7 | Strong |
| Bank acquirer | Local and international cards | 1.5 to 2.5% | T+1 to T+3 | Strong at volume |
| PayNow QR | Bank accounts | 0.5 to 1.3% | T+1 | Strong |
| Bank transfer | All banks | 0% for seller | 1 to 3 days after approval | Strong for large accounts |
| Cheque | Companies | 0% | 5 to 10 days | Declining |
Also check any monthly fees, often SGD 0 to 50 depending on the provider, and the cost of refunds, which are frequent in training when a session is rescheduled.
Mini case study
Rachel, CFO of a training provider in Singapore, collects SGD 1,700,000 per year from 380 corporate clients. Her average collection time is 38 days, and 12% of registrations are never paid.
She invests SGD 6,500 in gateway integration and automatic invoicing. If 45% of revenue goes through cards and PayNow at a blended 2% fee, the annual cost is SGD 15,300. In return, the average collection time drops to 23 days (40% faster), freeing about SGD 70,000 of cash, and unpaid registrations fall from 12% to 7% on online bookings, recovering around SGD 38,000 per year. Estimated net gain: about SGD 23,000 in year one, a 2026 order of magnitude.
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FAQ
How much does payment gateway integration on a B2B website cost?
Budget SGD 3,500 to 8,500 excluding GST in 2026 for a full integration with registration flow and automatic invoicing. A simple integration on an existing site, without invoicing, starts around SGD 1,700.
What fees does the gateway charge?
Fees usually range from 1.5% to 3.4% per card transaction, and lower for PayNow. Above SGD 900,000 processed per year, negotiating towards the lower end of the range is realistic.
How long does merchant onboarding take?
Allow 1 to 4 weeks between application and live activation, depending on KYC checks. Start the application as soon as the project is signed, in parallel with development.
Is 3D Secure mandatory?
It is strongly recommended and often required by issuers for online card payments. It sharply reduces fraudulent chargebacks, which stay below 0.1% of transactions on a well-configured B2B site.
Can invoices be generated automatically?
Yes, the PDF invoice with UEN, GST registration number and 9% GST is emailed seconds after payment confirmation. This module costs SGD 700 to 1,700 and removes manual entry of every invoice.
Let's scope your project. Tell us your annual volume, preferred provider and invoicing tool, and we will price the gateway integration with a B2B flow and a schedule aligned with merchant onboarding. Detailed quote within 48 h. WhatsApp +221 77 596 93 33. Request a free quote
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
