Get Messages Usage Report changedapi/beta/organization/usage_report/retrieve_messages
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137137## Headers
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139- `"anthropic-version": optional string`
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141 The version of the Claude API you want to use.
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143 Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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139145- `"anthropic-beta": optional array of AnthropicBeta`
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141147 Optional header to specify the beta version(s) you want to use.
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