The verdict in three sentences
A client portal with online payments in Miami costs 30,000 to 65,000 USD in 2026 depending on automation level: invoice payment, dunning, accounting reconciliation. Expect a 9 to 14 week build and maintenance around 1,000 USD/month. The main gain is financial: a better collection rate and shorter payment delays.
Payment modules and their cost
Price depends on integrated payment methods and dunning automation. Each brick delivers a measurable cash-flow gain.
| Payment module | Function | 2026 cost (USD) |
|---|---|---|
| Invoice view and download | Foundation | 9,000 |
| Card payment (Stripe Billing) | Transactional | 12,000 |
| ACH / bank transfer | Transactional | 10,000 |
| Automated dunning (email/SMS) | Collections | 9,000 |
| Automatic accounting reconciliation | Back-office | 13,000 |
| Collections dashboard | Management | 7,000 |
A full portal with payments and reconciliation approaches 60,000 to 65,000 USD.
Impact on collection rate
The real ROI of a payment portal shows up in cash flow. Here is a 2026 order-of-magnitude estimate for an SMB invoicing 400,000 USD/month.
| Metric | Before portal | After portal | Gain |
|---|---|---|---|
| Average payment delay | 52 days | 34 days | -18 days |
| 30-day collection rate | 61 % | 84 % | +23 pts |
| Manual dunning time | 22 h/month | 6 h/month | -16 h |
| Invoices unpaid > 90 days | 4.2 % | 1.5 % | -2.7 pts |
Cutting the payment delay by 18 days frees significant cash on a 400,000 USD monthly receivables base.
Mini case study
Priya runs an industrial cleaning firm in Miami, invoicing 400,000 USD/month to 90 B2B clients. With a 52,000 USD portal integrating Stripe Billing and automated dunning, she cuts her payment delay from 52 to 34 days. On a monthly receivables base, those 18 days recovered represent roughly 240,000 USD of cash freed permanently. Adding the 16 dunning hours saved each month (about 880 USD), the portal pays back in under 15 months from the cash and time effect alone.
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FAQ
Which payment methods should we prioritize?
Card via Stripe Billing covers most B2B clients, with ACH for larger invoices. SSO streamlines login for clients using corporate identity providers.
Is automated dunning customizable?
Yes: you set the delays (D+7, D+15, D+30), tone and channels (email, SMS). Automation avoids costly missed follow-ups.
Does the portal connect to my accounting system?
Yes, via API or export. Automatic payment reconciliation is the module that saves the back-office the most time.
What is the go-live timeline?
Plan on 9 weeks for a simple payment portal and up to 14 weeks with accounting reconciliation and multi-channel dunning.
Are online payments secure?
Yes: encryption, PCI-compliant processors and transaction logging. No card data is stored on the portal itself.
Let's scope your project. Share your monthly invoice volume and target payment methods, and we'll price the right collections portal. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
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.
