The verdict in three sentences
An SME that chases 300 customers by phone with a DSO of 85 days is financing its customers for free with its own cash or its bank overdraft. An automated dunning system using email, SMS and WhatsApp with an embedded mobile payment link (Wave in West Africa) costs roughly 2,500,000 to 5,000,000 FCFA (3,810 to 7,620 EUR) and ships in 6 weeks. Targeting a 55-day DSO is realistic in year one, and every month gained frees tens of millions of FCFA.
Why manual dunning hits a ceiling
In most distributors and wholesalers, dunning relies on one or two people in accounting who call customers from an Excel export of the ERP. The result: big accounts get chased, small amounts are forgotten, and nobody knows who promised to pay when.
The three classic flaws: dunning starts too late (often after 30 days overdue), it is not tracked, and a customer who wants to pay still has to travel or send a transfer with an unreadable reference. Mobile payment fixes the last point: a customer who receives a payment link on WhatsApp can pay in 30 seconds.
The standard dunning sequence and its cost per channel
| Step | Timing | Channel | Estimated 2026 unit cost |
|---|---|---|---|
| Courtesy reminder | D-3 before due date | Email + WhatsApp | Email near zero, WhatsApp 10 to 30 FCFA |
| Due date notice | Day D | WhatsApp with payment link | 10 to 30 FCFA |
| First reminder | D+7 | SMS + email | SMS 15 to 25 FCFA |
| Second reminder | D+15 | WhatsApp + scheduled call | Call: 5 minutes of an agent |
| Formal notice | D+30 | Signed PDF letter by email | Near zero |
| Order block | D+45 | Alert to the sales rep in the CRM | Internal |
Messaging costs stay marginal: for 300 customers and 4 reminders a month on average, the SMS and WhatsApp bill runs around 25,000 to 40,000 FCFA a month. On collection, Wave charges the merchant about 1 % on payments received, compared with an overdraft at 8 to 10 % a year.
What a 2.5 to 5 million FCFA budget covers
| Component | Simple version | Full version |
|---|---|---|
| Connection to the ERP (Sage, Odoo, file export) | Daily file import | Real-time API |
| Dunning scenarios | 1 standard scenario | Scenarios per customer segment (key accounts, retailers) |
| Channels | Email + SMS | Email + SMS + WhatsApp Business |
| Payment link | Wave | Wave + Orange Money + referenced transfer |
| Automatic reconciliation | Assisted manual | Automatic on confirmed Wave payment |
| DSO dashboard | Weekly aged balance | DSO by rep, customer and region |
| Market order of magnitude | 2,500,000 FCFA | 5,000,000 FCFA |
| Lead time | 4 weeks | 6 weeks |
At Kolonell, this kind of project falls under the custom application grid: 2,500,000 to 4,000,000 FCFA for a simple application, 4,000,000 to 7,000,000 FCFA for medium complexity (about 3,810 to 6,100 EUR, then 6,100 to 10,670 EUR). Maintenance then runs between 35,000 and 120,000 FCFA a month depending on the support level.
The real differentiator is not sending messages, it is automatic reconciliation: when Wave confirms a payment by webhook, the invoice must switch to paid and the next reminder must be cancelled. Without it, you chase customers who have already paid, which damages the relationship.
Mini case study
Aïssatou, CFO of an electrical equipment distributor, manages annual revenue of about 3.6 billion FCFA, close to 9.9 million FCFA of sales per day. With a DSO of 85 days, receivables sit around 840 million FCFA.
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If DSO drops to 55 days, receivables fall to about 545 million FCFA: nearly 295 million FCFA of cash released. At a 9 % overdraft rate, that means about 26 million FCFA of financing costs avoided per year.
On time, her two collection agents spent about 60 % of their week on the phone. The system leaves them only disputed cases, around twenty customers a month instead of 300. With a 4,500,000 FCFA project and 75,000 FCFA monthly maintenance, the investment is covered in under three months. Illustrative scenario, not a real client.
FAQ
Do customers accept being chased on WhatsApp?
Yes, provided you use a verified WhatsApp Business account, polite message templates and an opt-out. In practice, WhatsApp read rates often exceed 80 %, versus 20 to 30 % for email.
Do we need to change ERP?
No. The system reads invoices and due dates from your current tool, by API or daily export. A file export is enough to start and cuts the budget by 500,000 to 1,000,000 FCFA.
What about customer data protection?
In Senegal, Law 2008-12 governs personal data processing and the CDP may require a declaration; the UAE has its own data protection law. Business owners' phone numbers are personal data: add a clause to your terms of sale.
Does the mobile payment link work for large amounts?
Limits depend on the payer account's verification level. For invoices above a few million FCFA, also offer a bank transfer with a pre-filled reference.
How quickly does DSO improve?
First effects show from month two, because pre-due reminders reduce short delays. Allow 6 to 9 months to lock in a 25 to 30-day gain.
Let's scope your project. Send us your aged balance and the name of your ERP: we will price a scope between 2.5 and 7 million FCFA with a 6-week plan. 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.
