I am sending a document to the customer for signing, after customer signed the document it comes to me again for counter sign and then i send it to customer.

What i want is when customer signed it and send it to me again for countersign i want that process to be automated.

I want that it should automatically get the countersign and send it to the customer.

As the document is safe in zoho sign customer can not edit it, so their is no need to check each and every docs again and again. So i want countersign part to be automated. 

Please help me to find out the best possible way to do it asap.

Thanks!!