Multiple API Keys per Sub Account
As a user I would like to have several API Keys for a sub account so that i can roll out a change of the keys without interruption of the service
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Sympa Sysops
    
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  This is quite huge thing. It is almost impossible to rotate key and deploy it into production without interruption. Having something like primary and secondary key which you can rotate individually would be enough. Then one could deploy unused key into all systems and then rotate another one.