Hello,
I have understood your project description, stating that, some edits needs to be performed in the code, such as, When user check out > There Unique ID into a custom field for that product > save; and when user try to "add_to_cart", the action which needs to be performed is that, check if the user id is in the field you wrote > true > show, show notice bought cant bought again, else put it on the user's cart.
The implementation of your project requirements would be performed in an efficient manner, due to the fact that I have previously worked on various such projects.
I am having over 6 years of experience in Web design HTML, CSS, JS, Bootstrap, Ajax, Responsive, MySQL, PHP and WordPress.
You may have a look at some of my previous WordPress websites:
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I start working on a project immediately after the work is assigned, thereby assuring you with best quality of work,promptness regarding your queries and completion of the project,according to the specified time-requirements.
Let us have a quick conversation to proceed further with the project.
Awaiting your positive response.
With Regards,
Nikita