Add support for AI Credit billing endpoint

[elliotpeele]

With the recent introduction of AI Credits, there is a new endpoint for AI Credit usage:

/organizations/ORG/settings/billing/ai_credit/usage

The data structure looks to be the same as the premium request billing API.

{
"timePeriod": {
"year": 2026,
"month": 6
},
"organization": "ORG",
"usageItems": [
{
"product": "Copilot",
"sku": "Copilot AI Credits",
"model": "Auto: Claude Haiku 4.5",
"unitType": "ai-credits",
"pricePerUnit": 0.01,
"grossQuantity": 3956.1799545,
"grossAmount": 39.561799545,
"discountQuantity": 3956.1799545,
"discountAmount": 39.561799545,
"netQuantity": 0.0,
"netAmount": 0.0
},
{
"product": "Copilot",
"sku": "Copilot AI Credits",
"model": "Auto: Claude Sonnet 4.6",
"unitType": "ai-credits",
"pricePerUnit": 0.01,
"grossQuantity": 9498.6969165,
"grossAmount": 94.986969165,
"discountQuantity": 9564.710256,
"discountAmount": 95.64710256,
"netQuantity": 0.0,
"netAmount": 0.0
}
]
}

[gmlewis]

Thank you, @elliotpeele - would you like to work on this issue, or shall we open it up to our other great contributors?

[elliotpeele]

@gmlewis, I don't have time right now to do the implementation. Please feel free to open it up to other contributors. Thanks for asking.

[maishivamhoo123]

@gmlewis can you please assign this issue to me ? i love to contribute to this issue .

[maishivamhoo123]

@elliotpeele can you please send the official docs link for this /organizations/ORG/settings/billing/ai_credit/usage endpoint. Thank you.

[elliotpeele]

@maishivamhoo123, it doesn't look like GitHub has published the API documentation yet.