Many approval problems can be avoided by providing a valid E-mail Address at the time you are making the payment.
Many customers, at the time of purchase, inform any email on the store page. When this happens, they no longer receive updates about the purchase, such as data, value, payment method, etc. If anything goes wrong with the payment, it is to this email address that the information is sent, and if the customer does not have access to the email, he stops being informed.
Another reason is that, often depending on the payment method you have chosen, the institution needs to check purchase information with the customer, and they notify you by email. The customer, having no access to the e-mail, cannot make such confirmation and then has his order canceled, bringing an unnecessary frustration.
Other factors to watch out for in your purchase is to always check if you are in the correct store where you want to buy your product, check if you are logged in to the correct account (in cases of customers who have more than one account) and double check the information placed on the store page, thus preventing data from being placed incorrectly.