How can I attach a Digital Signature to my sales Invoice whenever it is required?

ERPNext
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How can I attach a Digital Signature to my sales Invoice whenever it is required?

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Reference

Otherwise check this post.

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@NCP We are not able to find the github link as we want to install this app on a self hosted instance.

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It’s available in the frappe marketplace, no open GitHub link.

but try it, I’m not sure if it is workable or not.