Define what the purchase includes
Request a written list of the files, installation help, license scope and support period included in the price. Establish whether the purchase covers one domain, multiple deployments or future updates. A one-time headline price does not tell you whether ongoing support, additional modules or server administration will cost more.
Test the order lifecycle in the demo
Follow a sample order from submission through status changes, partial completion and cancellation where supported. Inspect how balance deductions and refunds are recorded. A polished catalog is only part of the product. Your business also depends on clear administrative records and a workable process for resolving failed or ambiguous orders.
Check the integrations you need
List the provider APIs and payment routes you intend to use, then ask whether those exact integrations are included and maintained. Avoid accepting a vague claim that all providers or all gateways work. Ask what information is required to configure each connection and who is responsible when the external service changes its interface.
Plan the handover and exit
Ensure that you receive access to the purchased code, deployment instructions and any necessary administrative accounts. Keep supplier and payment credentials under your control. Ask how customers, balances and order records can be exported if you later change software. Compare the total operating cost and maintenance responsibilities before choosing the cheapest license.
Is a working demo enough evidence to buy a script?
It is a useful starting point, but licensing, support, integrations, data ownership and operational testing still need review.