| API | Description | Category | Date |
|---|---|---|---|
| SaaSy | Online subscription service | Backend | 2012-09-25 |
| MoneyBird | Online billing service | Enterprise | 2009-03-19 |
| WORKetc Web Service | Small business management software suite | Enterprise | 2010-03-10 |
| Cashboard | Financial and time tracking service | Enterprise | 2011-03-08 |
| BlueFolder | service management software | Enterprise | 2011-03-08 |
| LicenseCube | Billing systems licensing service | Enterprise | 2012-02-02 |
| NextUser | Subscription sales management platform | Enterprise | 2012-08-09 |
| Monexa Billing | Enterprise payment and billing automation service | Enterprise | 2012-08-13 |
| Zuora | Subscription billing service | Financial | 2009-02-24 |
| Vindicia | Online billing service | Financial | 2009-02-24 |
| billomat | Online billing service | Financial | 2010-03-31 |
| Maventa e-invoicing | Electronic invoicing services | Financial | 2010-10-28 |
| CurdBee | Online billing software | Financial | 2010-10-04 |
| Greendizer | Invoicing designed for developers | Financial | 2011-01-20 |
| SnapBill | Online billing service | Financial | 2011-03-07 |
| Blesta | Billing Service | Financial | 2011-05-31 |
| 3Scale Billing | API management services | Financial | 2011-10-06 |
| PayPal Invoicing | PayPal Invoicing APIs | Financial | 2011-10-19 |
| Merchant's Mirror | Accounting software | Financial | 2011-11-29 |
| Invoicefu | Online invoicing service | Financial | 2012-03-13 |





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