FreshBooks API integration is quite tricky and a technologically complex process. It is hard to implement without months of investigation. Also, even after its development, you must be ready for its further maintenance and upgrade.
But, there is a solution that can help you to connect your B2B software with FreshBooks easily. It’s HexaSync – a Hybrid Integration Platform that helps businesses automate their operations by connecting perfectly to both Legacy systems and modern SaaS applications. HexaSync provides a great number of API methods for managing the data. For example, with their help, you can get a list of bills and customers. FreshBooks update customer info, get info about taxes, add and update bills, etc.