Add Sender Signature In Document

Hi,

I'm sending the document using PHP API

My document has Two signature part.

1. For Customer

2. For Sender

Both need to sign the document.

{{Sig_es_:signer:signature}} used this text tag for sign the document by Customer

{{Sig1_es_:sender:signature}} used this text tag for sign the document by Sender

I'm customer get signed but send not able to sign the document.

Can you help me how to overcome this problem.