eBay uses unique identifiers called “application keysets” that tell eBay which application is making a call. The application keyset serves as your application’s credentials.
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Application ID/client ID—Uniquely identifies your application; can’t be changed
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Dev ID—Uniquely identifies your developer profile; can’t be changed
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Cert ID/secret—A client secret, like a password for this keyset, that should be kept confidential; can be reset
You can create a separate keyset for the Sandbox and Production environments.
Tip: Just as you would store and protect passwords, use the same caution in storing and using your application keyset. For example, if authorization strings are hard-coded in a compiled application, an unethical individual could see the IDs by inspecting or reverse engineering. We highly recommend using strong encryption of the IDs in your application to prevent credential theft.