How do I create an automation for a client to confirm receipt of a product?

I have a form set up for users to submit when requesting our service, and I'd like to create a way for that client to confirm they received the product at the end without having to send e-mails back and forth or have them physically sign anything. I don't want to give users access to my sheet or reports. It seems that DocuSign could work but I don't have the budget to pay for that. Any suggestions?

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