# Newline Customers API

**Canonical:** https://apis.io/apis/fifth-third-bancorp/newline-customers-api/  
**Provider:** Fifth Third Bancorp — https://apis.io/providers/fifth-third-bancorp/  
**Base URL:** https://sandbox.newline53.com/api/v1  
**Documentation:** https://developers.newline53.com/reference/customers

Newline Customers API is one of 13 APIs that [Fifth Third Bancorp](https://apis.io/providers/fifth-third-bancorp/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Customers, KYC, Onboarding, Compliance, and United States. The published artifact set on APIs.io includes an OpenAPI specification, an API reference, and API documentation.

Create, list, retrieve, update, and archive the Customers who hold accounts on a Newline program. Handles personally identifiable information (PII), Tax Identifier/SSN capture and validation, customer types (primary and others), customer statuses, and triggers the KYC/AML evaluation lifecycle that Fifth Third runs when a Customer is onboarded to a product.

## Machine-readable artifacts (3)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/fifth-third-bancorp/refs/heads/main/openapi/newline-platform-api.json
- **APIReference** — https://developers.newline53.com/reference/customers
- **Documentation** — https://developers.newline53.com/reference/overview-of-customer-types

## Other Fifth Third Bancorp APIs (12)

- [Newline Auth API](https://apis.io/apis/fifth-third-bancorp/newline-auth-api/)
- [Newline Customer Products API](https://apis.io/apis/fifth-third-bancorp/newline-customer-products-api/)
- [Newline Products API](https://apis.io/apis/fifth-third-bancorp/newline-products-api/)
- [Newline Pools API](https://apis.io/apis/fifth-third-bancorp/newline-pools-api/)
- [Newline Custodial Accounts API](https://apis.io/apis/fifth-third-bancorp/newline-custodial-accounts-api/)
- [Newline Synthetic Accounts API](https://apis.io/apis/fifth-third-bancorp/newline-synthetic-accounts-api/)
- [Newline Transfers API](https://apis.io/apis/fifth-third-bancorp/newline-transfers-api/)
- [Newline Combined Transfers API](https://apis.io/apis/fifth-third-bancorp/newline-combined-transfers-api/)
- [Newline Transactions API](https://apis.io/apis/fifth-third-bancorp/newline-transactions-api/)
- [Newline Returns API](https://apis.io/apis/fifth-third-bancorp/newline-returns-api/)
- [Newline Virtual Reference Numbers API](https://apis.io/apis/fifth-third-bancorp/newline-virtual-reference-numbers-api/)
- [Newline Sandbox API](https://apis.io/apis/fifth-third-bancorp/newline-sandbox-api/)

## Tags

Customers, KYC, Onboarding, Compliance, United States

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/fifth-third-bancorp/newline-customers-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/fifth-third-bancorp/.