> For the complete documentation index, see [llms.txt](https://chekin.gitbook.io/chekin-public-api/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chekin.gitbook.io/chekin-public-api/api-reference/einvoicing/provider-differences.md).

# Provider differences

A field-by-field summary of what changes per provider across the whole eInvoicing flow.

| Action                        | MyData (`MY_DATA`)                                                                    | AT (`AT`)                                              | AADE (`AADE`)                                               | AdE (`ADE`)                                                        |
| ----------------------------- | ------------------------------------------------------------------------------------- | ------------------------------------------------------ | ----------------------------------------------------------- | ------------------------------------------------------------------ |
| Supplier `data` field         | `gr-mydata-other-tax` (required)                                                      | —                                                      | —                                                           | `legal_storage.email` (required), `invoice_description` (optional) |
| Supplier `province`           | Not used                                                                              | Not used                                               | Not used                                                    | Required                                                           |
| AADE credentials in supplier  | ❌                                                                                     | ❌                                                      | ✅ (`aade_username`, `aade_password`, `external_housing_id`) | ❌                                                                  |
| Series types                  | `STANDARD`, `CREDIT_NOTE`, `RECEIPT`, `RETAIL_SALES_CREDIT_NOTE`                      | `STANDARD`, `CREDIT_NOTE`, `RECEIPT`                   | ❌ (no series)                                               | `STANDARD`, `CREDIT_NOTE` (`RECEIPT` optional)                     |
| Invoice request: extra fields | `nationality`, `fiscal_code`, address, `fee_sub_total`, `accommodation_tax_sub_total` | `nationality`, `fiscal_code`, address, `fee_sub_total` | ❌ (use declarations)                                        | — (only `standard_sub_total` needed)                               |
| Invoice response: count       | Multiple (per category)                                                               | Multiple (per category)                                | —                                                           | Single                                                             |
| Item categories               | `standard`, `fee`, `accommodation_tax`                                                | `standard`, `fee`                                      | `standard`                                                  | `standard`, `fee`                                                  |
| Sub-totals fields             | standard, fee, accommodation\_tax                                                     | standard, fee                                          | —                                                           | standard                                                           |
| Credit note                   | ✅                                                                                     | ✅                                                      | ❌                                                           | ✅                                                                  |
| Short-term declaration        | ❌                                                                                     | ❌                                                      | ✅                                                           | ❌                                                                  |