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Sign up with Cloudmersive from here
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As soon as you do that, an email will be sent to the address you've provided during sign up with the confirmation link.
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You may need to sign in to your Cloudmersive account with the newly signed up credentials.
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Click on view and manage keys.
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Copy your PUBLIC API KEY.
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Paste it as a value of api_key variable in Cloudmersive section.