| API | Description | Category | Date |
|---|---|---|---|
| 360 Business Tool | Business management service | Enterprise | 2012-07-05 |
| ClientBill | Online invoicing service | Office | 2011-08-15 |
| e-conomic | Online accounting software | Financial | 2011-03-21 |
| InvoiceClarity | Invoice management service | Financial | 2009-11-29 |
| Maventa e-invoicing | Electronic invoicing services | Financial | 2010-10-28 |
| PayPal | Online payments | Payment | 2005-09-04 |
| PayPal Invoicing | PayPal Invoicing APIs | Financial | 2011-10-19 |
| ShoeBooks | Accounting and Bookkeeping Service | Financial | 2013-04-24 |





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