# Document types Building with an AI agent? Start at https://docs.payme.io/agents.md Values of `doc_type` in [Create a document](/payments/invoices/post-create-invoice). Documents are returned with the same value. | `doc_type` | Document | Invoicing-service name | |---|---|---| | `100` | Work order | `order` | | `200` | Delivery note | `delcert` | | `300` | Transaction invoice | `deal` | | `305` | Tax invoice | `invoice` | | `320` | Invoice receipt | `invrec` | | `330` | Credit invoice (refund) | `refund` | | `400` | Receipt | `receipt` | | `405` | Donation receipt | `trec` | | `600` | Price offer | `offer` |