Combine a contract and invoice?

[dlleon]

I would like to just issue a contract in square, and when the customer signs it, they can pay an amount specified in the contract, without me having to do a separate invoice. 

I know I can put in payment terms in the contract (deposit plus one payment) but, when a client signs the contract, there's no link for the client to pay.

Is there a way to automate this, either through square or through Zapier?