--- title: "How Authentication Works for Marketplace APIs" url: https://www.suger.io/resources/blog/authentication-for-marketplace-apis/ canonical: https://www.suger.io/resources/blog/authentication-for-marketplace-apis/ type: Blog description: "Marketplace API access is machine-to-machine, long-lived and organisation-scoped. That combination breaks most of the credential habits teams bring to it." --- # How Authentication Works for Marketplace APIs > Canonical HTML version: https://www.suger.io/resources/blog/authentication-for-marketplace-apis/ 1. [Home](/) 2. / 3. [Resources](/resources/) 4. / 5. [Blog](/resources/blog/) 6. / 7. How Authentication Works for Marketplace APIs # How Authentication Works for Marketplace APIs Marketplace API access is machine-to-machine, long-lived and organisation-scoped. That combination breaks most of the credential habits teams bring to it. [![Chengjun Yuan](/leadership/chengjun.jpeg)](/resources/blog/author/chengjun-yuan/) [Chengjun Yuan](/resources/blog/author/chengjun-yuan/) Co-founder & CTO, Suger · Aug 14, 2026 ![How Authentication Works for Marketplace APIs](/images/blog/authentication-for-marketplace-apis/hero.png) Explore AI Summary [![](/logos/company/openai.svg)](https://chat.openai.com/?q=Read%20and%20summarize%20https%3A%2F%2Fwww.suger.io%2Fresources%2Fblog%2Fauthentication-for-marketplace-apis%2F%2C%20then%20cite%20the%20source.%20Focus%20on%20what%20it%20says%20about%20Cloud%20GTM%2C%20Marketplaces. "Summarize with ChatGPT")[![](/logos/company/anthropic.svg) ](https://claude.ai/new?q=Read%20and%20summarize%20https%3A%2F%2Fwww.suger.io%2Fresources%2Fblog%2Fauthentication-for-marketplace-apis%2F%2C%20then%20cite%20the%20source.%20Focus%20on%20what%20it%20says%20about%20Cloud%20GTM%2C%20Marketplaces. 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"Summarize with Perplexity") Table of Contents - [The client-credentials flow, and why it is the right one](#the-client-credentials-flow-and-why-it-is-the-right-one) - [The four failures this shape produces](#the-four-failures-this-shape-produces) - [Scoping: the question to ask before issuing a credential](#scoping-the-question-to-ask-before-issuing-a-credential) - [Credentials across several marketplaces](#credentials-across-several-marketplaces) - [Rotation without an outage](#rotation-without-an-outage) - [Frequently asked questions](#frequently-asked-questions) - [Takeaways](#takeaways) _Marketplace API authentication is machine-to-machine: there is no user in the loop, the integration runs unattended for years, and the credential is scoped to an organisation rather than to a person. Every one of those properties changes how the credential has to be handled._ * * * Most API integrations a team has built before are one of two shapes. Either a user signs in and the app acts on their behalf, or a service calls an internal system inside a trusted network. Marketplace integrations are neither. They run unattended, they cross an organisational boundary, and they hold authority over things with money attached — offers, entitlements, usage that becomes an invoice. The habits that work for the first two shapes fail here in specific, predictable ways. * * * ## **The client-credentials flow, and why it is the right one** The OAuth 2.0 client-credentials grant exists for exactly this case: a program authenticating as itself, with no user present. The Suger API [uses this flow](https://doc.suger.io/api/). The shape is: 1. Create an OAuth App, which holds the credential pair. 2. Exchange those credentials at the token endpoint for a bearer token. 3. Send `Authorization: Bearer ` with each request. 4. The token is valid for **one hour**; when it expires, exchange again. Two properties of that flow are worth stating explicitly, because they are what make it appropriate: - **The long-lived secret is never sent to the resource API.** Only the short-lived token is. A leaked token expires; a leaked client secret does not. - **The identity is the application, not a person.** Nobody’s departure breaks the integration, and no individual’s access level silently determines what the integration can do. That second point is the one teams get wrong most often, usually by generating credentials against a named employee’s account because it was faster. * * * ## **The four failures this shape produces** Failure What it looks like The fix **Token fetched per request** Latency and rate-limit pressure that scales with traffic, for no benefit Cache the token; refresh on expiry or on a 401 **Token cached past expiry** Intermittent 401s that “resolve themselves” and are never diagnosed Refresh proactively before the hour is up, and handle 401 as a refresh trigger rather than an error **Credential tied to a person** The integration dies when they change roles The credential belongs to an application, held in a secret manager **One credential for everything** A read-only reporting job holds authority to issue offers Separate credentials per consumer, scoped to what that consumer does The second is the most under-diagnosed. A token with a one-hour life and a caching layer that refreshes only on failure will produce a burst of errors at the top of every hour, distributed across whatever was in flight. It looks like flakiness in the API. It is not. * * * ## **Scoping: the question to ask before issuing a credential** The organisation-scoped path structure — most Suger endpoints sit under an organisation — is a useful prompt, because it makes the blast radius of a credential concrete. Ask three questions for every integration you issue credentials to: 1. **Does it write, or only read?** A dashboard, a warehouse loader and a reconciliation job are all read-only. Most integrations are. 2. **Does it need offers, or only entitlements?** The ability to create an offer is the ability to set a price. Very few systems need it. 3. **What happens if this credential is published to a public repository tomorrow?** If the honest answer involves phoning customers, the scope is too wide. The pattern that holds up is one credential per consuming system, each with the narrowest authority that system’s job requires — not one “integration user” that everything shares. The cost is a few more secrets to manage. The benefit is that a compromise is bounded and an audit is answerable. * * * ## **Credentials across several marketplaces** Everything above is about the API you call to run your marketplace business. Underneath it sits a second layer: the credentials that connect to each marketplace itself, and those multiply. Each cloud provider has its own authentication model, its own console for issuing credentials, its own rotation expectations and its own idea of which role can grant what. A team selling through several marketplaces ends up holding several unrelated credential sets, typically issued at different times by different people under different assumptions. The practical consequences show up during an audit rather than during operation: - **Nobody can enumerate them.** The question “what has access to our AWS Marketplace seller account?” takes days. - **Rotation never happens**, because rotating a credential nobody can attribute is a change nobody wants to make. - **Offboarding is incomplete**, because credentials issued under a personal account survive the person. The mitigation is unglamorous and works: keep an inventory of every marketplace credential with an owning system and an owning team, hold them in a secret manager rather than in configuration, and give each one a rotation date that somebody is accountable for. Who should hold which access is worth deciding deliberately — we covered that in [Who Should Have Which Role](/resources/blog/marketplace-access-roles/). * * * ## **Rotation without an outage** Rotation fails when it is treated as a swap. The safe pattern is overlap: 1. Issue a second credential alongside the first. 2. Move consumers to it one at a time, verifying each. 3. Watch for use of the old credential until it goes quiet. 4. Revoke it. Step 3 is the one that gets skipped, and it is the one that prevents the outage — there is almost always one forgotten consumer, and finding it by revoking is a bad way to find it. If the platform cannot tell you whether a credential is still being used, treat that as a reason to keep the overlap window long. * * * ## **Frequently asked questions** **What authentication does the Suger API use?** The OAuth 2.0 client-credentials flow. You create an OAuth App, exchange its credentials for a bearer token valid for one hour, and send that token with each request. **Why use client credentials rather than an API key?** Because the long-lived secret is never sent to the resource API — only a short-lived token is. A leaked token expires on its own; a leaked static key does not. **How should a client handle a one-hour token?** Cache it and refresh proactively before expiry, and treat a 401 as a refresh trigger rather than an error. Fetching a token per request wastes latency; refreshing only on failure produces hourly error bursts. **Should every integration share one credential?** No. Issue one per consuming system, scoped to what that system does. Most integrations are read-only, and very few need the ability to create offers, which is the ability to set a price. **How do you rotate a marketplace credential safely?** Overlap rather than swap: issue the new credential, migrate consumers one at a time, watch until the old one goes quiet, then revoke. Revoking to discover who was using it is how outages happen. * * * ## **Takeaways** - Client credentials fit because there is no user: the application is the identity, and no individual’s departure breaks it. - Cache the token and refresh before the hour is up. Refresh-on-failure produces a predictable hourly error burst. - Issue one credential per consuming system, scoped to its job. Most are read-only. - Keep an inventory of marketplace credentials with an owning system and an owning team, or rotation and offboarding will both be incomplete. - Rotate by overlapping, and revoke only once the old credential has gone quiet. Suger connects to every marketplace it supports and exposes one organisation-scoped, OAuth-authenticated API over all of them, so your systems hold one credential set rather than one per platform. [See how Suger handles integrations](/platform/integrations/), read the [API documentation](https://doc.suger.io/api/), or [talk to our team](/contact-us/). ## Sources Primary sources for the platform rules cited above. Last verified August 14, 2026. Cloud providers change fees, eligibility, and program terms without notice — check the source before relying on a figure. - [Suger docs: API](https://doc.suger.io/api/) — Suger product behaviour: OAuth 2.0 client-credentials flow, an OAuth App as the credential holder, bearer tokens valid for one hour, and organisation-scoped resource paths. ### Stay Updated Get the latest Cloud GTM insights, product updates, and marketplace strategies delivered to your inbox.