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From what I understood you wish your clients to be able to buy products, but without paying online. If this is the case you can use Freshbooks app:
You need to have an account (you can have a 30 days trial). For this please go to "integrations">"payments":
You can see here more details on how to create invoices with Freshbooks.
Back to your form you need to create an autoresponder email so that your clients receive a copy of their purchase:
If you wish you can clone the example form I created:
Kindly let us know if you need more assistance.