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Billtrust Platform API

By using the Billtrust Platform API, you accept the Billtrust Platform Developer Terms of Service.

Billtrust exposes public HTTP APIs on two lanes — Platform (arc-aegis…) and External (ext.arc-aegis…). They use different base URLs and different API keys. Start with Connect so you pick the right host and credential before calling a product.

Start here

Connect: gateways, keys, and headers — which base URL, which header, and how keys are issued per lane.

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Connect

Two lanes, base URLs, headers, and how to get platform vs external API keys.

Open Connect →
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Platform authentication

Login tokens and self-serve platform API keys for arc-aegis services.

Auth guide →
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API reference

Interactive OpenAPI explorer (Swagger UI).

Open reference →

Gateways at a glance

Lane Base URL (prod) Typical products
Platform https://arc-aegis.billtrust.com Auth, Users, Disputes, Credit, Payment rules
External https://ext.arc-aegis.billtrust.com Ingest, Remittance export

Products

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Ingest External

Push accounts, documents, contacts, and representatives into Billtrust.
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Disputes Platform

Cases, notes, attachments, assignees, reasons, and activity logs.
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Credit Platform

Credit applications, documents, business units, and field catalogs.
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Remittance export External

Export runs, schedules, payment payloads, webhooks, and audit logs.
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Payment rules Platform

Buyer card inclusion and exclusion lists for payment acceptance.
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Users Platform

User profile and access operations for platform automation.

Also see