Generating a CSR
On the Certificates and Key Pairs page, you can generate a certificate signing request (CSR) and download it to your local file system.
About this task
A CSR is an encoded file you can send to the certificate authority to apply for a public key certificate. If granted, the certificate authority will send you a response. The public key in the response must match the public key of this certificate.
Steps
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Go to Settings > Certificates and Key Pairs. 
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Locate the appropriate key pair by browsing, filtering, or searching for entries. 
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Click the details icon to expand the entry. 
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Click the CSR tab. 
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Click Export CSR. 
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Select the desired format: X509 PEM (.csr) or PKCS10 DER (.p10). 
Result
The file is saved to your local file system.