# Great American Carrier Services Billing API

**Canonical:** https://apis.io/apis/american-financial-group/great-american-carrier-services-billing-api/  
**Provider:** American Financial Group — https://apis.io/providers/american-financial-group/  
**Base URL:** https://prod01.api.gaig.com/billing  
**Documentation:** https://api-documentation.gaig.com/billing/index.html

Great American Carrier Services Billing API is one of 18 APIs that [American Financial Group](https://apis.io/providers/american-financial-group/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Insurance, Property Casualty, Specialty Insurance, Commercial Insurance, and Financial-Services. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

All business functions related to billing — payments, billing accounts, payment plans, bill charges and producer updates, plus One Inc payment notification acknowledgements.

## Operations (17)

| Method | Path | Summary |
|---|---|---|
| GET | `/api/endpoints` | — |
| POST | `/api/docs` | — |
| POST | `/api/createPayments` | — |
| POST | `/api/updateProducers` | — |
| POST | `/api/getAccountDetails` | — |
| POST | `/api/getAuthenticatedAccountDetails` | — |
| POST | `/api/getAuthenticatedAccountDetailsV2` | — |
| POST | `/api/getPoliciesForAccount` | — |
| POST | `/api/createNewBillingAccount` | — |
| POST | `/api/updateBillingAccount` | — |
| POST | `/api/getPaymentPlans` | — |
| POST | `/api/billCharges` | — |
| GET | `/api/synthetic` | — |
| POST | `/oneinc/notifications/acknowledgePayments` | — |
| POST | `/oneinc/notifications/acknowledgeScheduledPayments` | — |
| POST | `/oneinc/notifications/acknowledgePaymentMethods` | — |
| POST | `/oneinc/notifications/acknowledgeAutopayDetails` | — |

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/american-financial-group/refs/heads/main/openapi/american-financial-group-billing-openapi.yml
- **Documentation** — https://api-documentation.gaig.com/billing/index.html
- **APIReference** — https://api-documentation.gaig.com/billing/index.html
- **DeveloperPortal** — https://www.greatamericaninsurancegroup.com/agents-brokers/great-american-carrier-services
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/american-financial-group/refs/heads/main/overlays/american-financial-group-billing-overlay.yaml

## Other American Financial Group APIs (12)

- [Great American Carrier Services Shop API](https://apis.io/apis/american-financial-group/great-american-carrier-services-shop-api/)
- [Great American Carrier Services Submission API](https://apis.io/apis/american-financial-group/great-american-carrier-services-submission-api/)
- [Great American Carrier Services Product API](https://apis.io/apis/american-financial-group/great-american-carrier-services-product-api/)
- [Great American Carrier Services Risk Selection API](https://apis.io/apis/american-financial-group/great-american-carrier-services-risk-selection-api/)
- [Great American Carrier Services Rating API](https://apis.io/apis/american-financial-group/great-american-carrier-services-rating-api/)
- [Great American Carrier Services Forms API](https://apis.io/apis/american-financial-group/great-american-carrier-services-forms-api/)
- [Great American Carrier Services Issuance API](https://apis.io/apis/american-financial-group/great-american-carrier-services-issuance-api/)
- [Great American Carrier Services Policy API](https://apis.io/apis/american-financial-group/great-american-carrier-services-policy-api/)
- [Great American Carrier Services Document API](https://apis.io/apis/american-financial-group/great-american-carrier-services-document-api/)
- [Great American Carrier Services Ingestion API](https://apis.io/apis/american-financial-group/great-american-carrier-services-ingestion-api/)
- [Great American Carrier Services Risk Assessment API](https://apis.io/apis/american-financial-group/great-american-carrier-services-risk-assessment-api/)
- [Great American Carrier Services Letters API](https://apis.io/apis/american-financial-group/great-american-carrier-services-letters-api/)

## Tags

Insurance, Property Casualty, Specialty Insurance, Commercial Insurance, Financial-Services, OpenAPI, OAuth 2.0

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/american-financial-group/great-american-carrier-services-billing-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/american-financial-group/.