DataCite provides demo accounts for (we call it a sandbox) for users to test the DOI creation service through its Metadata Store (MDS). If you are curious about how the DOI creation process works this is a good place to start. Test accounts are for demonstration purposes only and are subject to deletion after a certain amount of time.
If you are planning on becoming a DataCite Member or User and you would like to prepare or test your integration in advance, contact us and we will provide you credentials to access the test environment.
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If you have any questions, requests or ideas please contact us!