List plan grants

{  "object": "list",  "data": [    {      "id": "grant_1a2b3c4d",      "customerId": "cus_1a2b3c4d",      "subscriptionId": "sub_1a2b3c4d",      "basePlanId": "plan_1a2b3c4d",      "planId": "plan_5e6f7a8b",      "planReleaseId": "release_5e6f7a8b",      "status": "active",      "duration": "until_date",      "durationCycles": null,      "startsAt": "2026-09-07T12:00:00.000Z",      "expiresAt": "2026-10-07T12:00:00.000Z",      "reason": "Evaluate Business features",      "source": "api",      "revokedAt": null,      "createdAt": "2026-09-07T12:00:00.000Z",      "updatedAt": "2026-09-07T12:00:00.000Z",      "events": [        {          "id": "event_1a2b3c4d",          "type": "created",          "reason": "Evaluate Business features",          "source": "api",          "previousExpiresAt": null,          "expiresAt": "2026-10-07T12:00:00.000Z",          "duration": "until_date",          "durationCycles": null,          "requestedExpiresAt": "2026-10-07T12:00:00.000Z",          "createdAt": "2026-09-07T12:00:00.000Z"        }      ],      "object": "plan_grant",      "livemode": false    }  ],  "hasMore": false}

{  "error": {    "type": "validation_error",    "code": "validation_error",    "message": "The request contains an invalid parameter.",    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.md"  }}

{  "error": {    "type": "authentication_error",    "code": "unauthorized",    "message": "A valid API key is required.",    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/unauthorized.md"  }}

{  "error": {    "type": "authentication_error",    "code": "forbidden",    "message": "You do not have permission to perform this operation.",    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/forbidden.md"  }}

{  "error": {    "type": "not_found_error",    "code": "not_found",    "message": "The requested resource was not found.",    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/not_found.md"  }}

{  "error": {    "type": "rate_limit_error",    "code": "rate_limited",    "message": "Too many requests. Retry after the interval specified in the Retry-After header.",    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/rate_limited.md"  }}

{  "error": {    "type": "internal_error",    "code": "internal_error",    "message": "An unexpected error occurred while processing the request.",    "doc_url": "https://commet.co/docs/api-reference/2026-08-27/errors/internal_error.md"  }}