le-cert-server
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Cloudflare

dnsProvider: "cloudflare"
dnsCredentials:
  CF_DNS_API_TOKEN: "your-dns-api-token"
  # OR use API key (not recommended):
  # CF_API_EMAIL: "user@example.com"
  # CF_API_KEY: "your-api-key"

See the Lego Cloudflare documentation for the full list of supported environment variables.

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