| API | Description | Category | Date |
|---|---|---|---|
| Klarna | eCommerce service | Payment | 2011-12-13 |
| Less Accounting | Online accounting service | Financial | 2010-02-11 |
| Maventa e-invoicing | Electronic invoicing services | Financial | 2010-10-28 |
| MoneyBird | Online billing service | Enterprise | 2009-03-19 |
| Ofuz | Customer management and invoicing service | Enterprise | 2010-12-15 |
| PayPal | Online payments | Payment | 2005-09-04 |
| PayPal Invoicing | PayPal Invoicing APIs | Financial | 2011-10-19 |
| Seasoo | Online invoicing service | Office | 2011-11-19 |
| ServiceM8 | Service job management service | Enterprise | 2011-11-29 |
| serviceminder | Service provider online solution service | Enterprise | 2012-01-13 |
| Stripe | Online payment service | Payment | 2011-10-17 |
| Tradeshift | Business Network and Invoice management service | Enterprise | 2011-04-11 |
| WorkflowMax | Job and Invoice Management | Office | 2011-08-08 |
| Xero | Online accounting service for SMBs | Financial | 2010-01-29 |
| Zoho Invoice | Online invoicing service | Financial | 2010-04-21 |





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