> ## Documentation Index
> Fetch the complete documentation index at: https://docs.awardforce.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Headers

> Required and optional headers for the Award Force API.

## Headers

<ParamField header="Accept" type="string" required>
  Defines the API version to use and response format.

  **Allowed values:**

  * `application/vnd.Creative Force.v2.3+json`
  * `application/vnd.Creative Force.v2.3+xml`
</ParamField>

<ParamField header="x-api-key" type="string" required>
  Valid API key used for authentication and authorisation. Refer to [Authentication](/pages/v2_3/authentication).
</ParamField>

<ParamField header="x-api-language" type="string">
  Defines the languages included in the response. If non are provided, the account default language is returned.

  <Info>
    You can request multiple languages using a comma-separated string of languages.
  </Info>

  **Allowed values:**

  * `all` (overrides any other values present)
  * `ar_AR`, `bg_BG`, `bn_IN`, `ca_ES`, `cs_CZ`, `cy_GB`, `da_DK`, `de_DE`, `en_GB`, `en_US`, `el_GR`, `es_NN`, `es_LA`, `fa_NN`, `fi_FI`, `fr_FR`, `fr_CA`, `he_IL`, `hi_IN`, `it_IT`, `ja_JP`, `ko_KR`, `lt_LT`, `ms_MY`, `nl_NL`, `nb_NO`, `pl_PL`, `pt_BR`, `ru_RU`, `sl_SI`, `sv_SE`, `sw_NN`, `th_TH`, `uk_UA`, `vi_VN`, `zh_CN`, `zh_HK`

  <Warning>
    The selected language must be supported by your account or a `400` error
    is returned.
  </Warning>
</ParamField>