A 'sender' is someone with aSign account login who uploads and signs documents or prepares documents to be signed by others, then collects them back via Sign.
For example, if you send a signature request to a client viaSign and that person simply signs the document, that person is an end-signer, not a Sign sender. You are the sender in this case because you prepared, sent, and collected the signed doc via Sign.
You do not need to pay for your end-signers as they are not considered senders.
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