How to secure a transaction of remote purchase / sale of a service / product without cryptocurrencies?

Question

Freelance

How to secure a deal like decentralized / centralized unbreakable contracts only without the use of cryptocurrencies, and methods that do not frighten customers)?

Answer 1

at all times the system of guarantors was used. when a third party trusted by both takes the money, before the start of the transaction and transfers it to its destination after verification or returns it.
For example, old-timers on the forums. or a safe transaction on the exchanges.

Answer 2

PayPal is kind of like a guarantor, read about safe transactions in paypal.

Answer 3

Depends on the task.
Do they pay on a global scale Visa/Mastercard without seeing each other?
In some ways, the bank provides protection from carders, in some ways, the trading platform presses sellers so that they do not cheat.
Somewhere there is a trusted intermediary who takes the money and gives it back as a result of the transaction.
Reputation is important - you send money to a trusted online store more calmly, you work more calmly with a verified customer / contractor ...
And there are systems for publishing / checking reputation.
Etc. etc......
In such a general formulation as yours - it is not clear why and what and how and which method is better.