Document operations with BILLšUse the BILL v3 APIWe recommend that you build all your integrations with the BILL v3 API. The BILL v2 API is currently in LTS (Long-Term Support) mode at BILL. In this section, we explain the set of BILL API operations you can perform with documents. Upload documents Get an invoice PDF Get an attachment (API reference) Get a bill attachment (API reference) Updated 8 days ago Bill approval workflowsUpload documents