We understand you concern but there is no need for it. All your transactions are protected so you can raise a dispute at the payment provider and request your money back anytime. This actually works really well. Therefore we are using 2 of the most trusted payment providers available (PayPal and Stripe).
All the results will be signed by the according laboratory and you can always check that with them.
If you have any more doubts or questions, feel free to chat with us or send us an email.