Is it possible to have the SSL certificates created on Let's Encrypt, download the 3 files (.crt, .key and chain file) and provide them to the vendor where our website is hosted?
No, that's not how Let's Encrypt works. Let's Encrypt expects you to use a client application (software installed on your web server) to talk to the certificate authority's API, instead of obtaining your certificate through some other method. The API is the only official interface to the certificate authority.
There are some third-party web interfaces that try to replicate the web-based interface of a traditional certificate authority, but these are unofficial and not recommended by Let's Encrypt, because they won't allow for automated renewal of your certificate. Let's Encrypt certificates last for only 90 days.
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