| API | Description | Category | Date |
|---|---|---|---|
| 1DayLater | Business expense tracking tool | Enterprise | 2010-02-07 |
| billFLO Seller | Invoice management service | Financial | 2011-02-15 |
| BillingOrchard | Online billing system | Payment | 2013-02-13 |
| billomat | Online billing service | Financial | 2010-03-31 |
| Billy's Billing | Bookkeeping software for entrepreneurs | Office | 2013-02-25 |
| BitPay Payment Gateway | Bitcoin Payment Service | Payment | 2012-10-29 |
| Blinksale | Online invoicing services | Financial | 2006-11-01 |
| Bunker App | Project management platform | Project Management | 2011-12-02 |
| Cashboard | Financial and time tracking service | Enterprise | 2011-03-08 |
| CashFlows | Web and mobile payment platform | Payment | 2012-04-02 |
| CurdBee | Online billing software | Financial | 2010-10-04 |
| entreprise-facile | Create entreprise-facile automations and mashups | Enterprise | 2010-03-10 |
| Factura Directa | Bill Management Service | Office | 2012-12-18 |
| fetchflow | Online invoicing and payment service | Enterprise | 2012-01-11 |
| FreshBooks | Online invoicing and time tracking | Financial | 2006-09-19 |
| Greendizer | Invoicing designed for developers | Financial | 2011-01-20 |
| Invoice Machine | Invoice management service | Financial | 2009-04-09 |
| Invoicefu | Online invoicing service | Financial | 2012-03-13 |
| Klarna | eCommerce service | Payment | 2011-12-13 |
| Less Accounting | Online accounting service | Financial | 2010-02-11 |





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