| API | Description | Category | Date |
|---|---|---|---|
| 1DayLater | Business expense tracking tool | Enterprise | 2010-02-07 |
| ActiveCollab | Collaboration & Project Management System | Tools | 2011-09-26 |
| 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 |
| Blesta | Billing Service | Financial | 2011-05-31 |
| 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 |
| Greendizer | Invoicing designed for developers | Financial | 2011-01-20 |
| Invoicefu | Online invoicing service | Financial | 2012-03-13 |
| Klarna | eCommerce service | Payment | 2011-12-13 |
| MinuteDock | Time Tracking Service | Project Management | 2012-10-04 |
| Ofuz | Customer management and invoicing service | Enterprise | 2010-12-15 |
| Paymill | Online payment solution service | Payment | 2012-08-15 |
| PayPal Invoicing | PayPal Invoicing APIs | Financial | 2011-10-19 |
| SalesKing | German online accounting service | Enterprise | 2012-08-09 |
| ServiceM8 | Service job management service | Enterprise | 2011-11-29 |





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