Should I Trust Third-Party Amazon Tools With My Data?

Connecting a third-party tool to your Amazon seller account means granting it access to some of your data. That is a reasonable thing to be cautious about. Your listings, sales figures, and advertising data are commercially sensitive. Before you connect anything, you should understand exactly what you are granting, how to check what is already connected, and how to pull the plug if you need to.

How SP-API access works

Most legitimate Amazon seller tools connect through Amazon's Selling Partner API (SP-API). This is Amazon's official system for granting third-party applications access to seller data. The important detail is that SP-API access is role-based. A tool does not get access to everything in your account. It requests specific roles, and you authorise those roles during the connection process.

Common SP-API roles include:

• Product Listing: Read and write access to your catalogue data (titles, descriptions, images, pricing).
• Orders: Read access to order information (what was purchased, shipping details, order status).
• Reports: Access to business reports, inventory reports, and other Seller Central report types.
• Analytics: Search term data, traffic and conversion reports.
• Finances: Settlement reports, fee breakdowns, refund data.

A tool that helps you optimise listings might request Product Listing and Reports access. A repricing tool might request Product Listing and Orders. An analytics tool might request Reports and Analytics. The principle is that a responsible tool requests only the roles it needs for the features it provides.

What to check before connecting a tool

Before authorising any tool, ask these questions:

1. Which roles does it request? The authorisation screen shows you the specific permissions. If a listing optimisation tool is asking for financial data access, that deserves a question. There may be a legitimate reason, but you should understand it before granting.
2. Does the tool have a clear privacy policy? Look for specifics: what data is stored, where it is hosted, how long it is retained, and whether it is shared with anyone. Vague statements like "we take security seriously" without details are not enough.
3. Is the tool listed in Amazon's Seller Central Partner Network? Legitimate SP-API applications go through Amazon's review process. You can find them in Seller Central under Partner Network. Tools that ask you to share your MWS auth token or seller credentials directly (rather than going through the standard OAuth flow) are a red flag.
4. Can you revoke access easily? Any tool connected through SP-API can be disconnected from Seller Central at any time, without needing the tool provider's cooperation. This is a fundamental safety net.
5. Does the company respond when you ask questions? A tool you are trusting with business data should have support that answers data handling questions. If they cannot explain what happens to your data, that is information.

How to check what you have already authorised

If you have been selling on Amazon for a while, you may have connected tools in the past and forgotten about them. It is worth auditing your connected applications periodically.

1. Log in to Seller Central.
2. Navigate to Partner Network (in the main navigation under Apps and Services, or search for "Manage Your Apps").
3. Select "Manage Your Apps" to see all applications with active authorisation.
4. Review each connected application. Check what roles it has and when you last used it.
5. Revoke access for any tool you no longer use or do not recognise.

This is a quick check that takes a few minutes and can prevent an unused application from retaining access to data it no longer needs.

How to revoke access

Revoking access is straightforward and immediate. In the "Manage Your Apps" section of Seller Central, find the application and select "Deauthorise" or "Revoke access". The tool loses API access to your account data immediately. You do not need to contact the tool provider, and you do not need their permission.

Revoking API access does not delete data the tool has already retrieved and stored. If you want stored data deleted, you will need to contact the tool provider directly and request deletion under their data retention policy (or under GDPR or equivalent regulations if applicable).

What a responsible tool should tell you

Beyond the basics of a privacy policy, a tool handling your Amazon data should be transparent about a few specific things:

• Data isolation: Your data should be stored separately from other sellers' data. Cross-contamination is not just a privacy issue; it is a competitive one.
• Data retention: The tool should state how long it keeps your data and what happens when you cancel or revoke access.
• Action confirmation: If a tool has write access (the ability to change your listings or submit feeds), it should require your explicit confirmation before making changes. A tool that modifies your live listings without asking is a liability.
• No data sharing between sellers: Your sales data, keyword research, and listing content should never be accessible to other sellers using the same tool.

How Rufusly handles your data

Since we are asking you to trust us with your data, here is what Rufusly does specifically:

• We request only the SP-API roles required for the features you use. If you only use listing optimisation, we do not need or request access to your financial data.
• Your data is stored in a database partition specific to your account. Other Rufusly users cannot access your data, and we do not aggregate seller data across accounts.
• We do not share your data with third parties, and we do not use your data to train AI models.
• Listing changes are never submitted to Amazon without your explicit approval in the app. You review and confirm before anything is sent.
• Our privacy policy covers the full details, including data retention periods and your rights regarding deletion.

You can connect your Amazon account to Rufusly through the standard SP-API OAuth flow. For a walkthrough of the connection process, see our guide to connecting Seller Central.

The MWS auth token red flag

Amazon's older Marketplace Web Service (MWS) system used auth tokens that sellers generated and shared directly with tools. This system is being phased out in favour of SP-API's OAuth flow, which is more secure because the tool never sees your Amazon credentials.

If a tool still asks you to generate and paste an MWS auth token, or worse, asks for your Seller Central login credentials, treat that as a strong warning sign. Legitimate tools have migrated to SP-API. A tool still relying on MWS tokens may not be actively maintained, and sharing credentials directly is never acceptable.

A practical audit checklist

Run through this quarterly, or whenever you connect a new tool:

• Check Seller Central's "Manage Your Apps" for all connected applications.
• Revoke access for tools you no longer use.
• Verify that each connected tool's requested roles match what it actually does for you.
• Read the privacy policy of any tool you connected more than six months ago. Policies change.
• Confirm that tools with write access require your approval before making changes.

For a broader look at the tools available to Amazon sellers and what to evaluate, see our features overview.