On the one hand, you can understand the programmers. How else will they be able to understand how much time they will need to improve and determine the final price for the work? Only by conducting a test autopsy.
And from the site owner's side: giving away your "brainchild" whatsapp number data without any guarantees of safety is very risky. It is worth understanding that an inexperienced or unscrupulous programmer can break some functions of the site, or accidentally delete it (yes, this is possible with certain accesses). Moreover, you will not be able to guarantee that your accesses will remain in one hands and will not pass to third parties or even competitors.
Create guest accesses
Therefore, be responsible in the matter of providing access. If necessary, do not be lazy in creating special guest accesses, under which you can clearly identify the "guest", and which will allow you to study the functionality and determine the scope of work.
Information prepared by Eva K. - Internet marketer of the production department.