How would we solve this problem about payments

[witcher_sense]

I figured out a important point in taking crytpo as payment methods,
let you have given a customer a $101 worth of goods, then he paid you $101 in bitcoin ok
than 5 customer comes and 5 of them purchase goods worth $46, $108, $106, $89, $100, respectively ok then those all pay you via bitcoin in price of that time of one bitcoin
than sometimes later like 3 hours later, you think that one women's payment is missing you have bill but there is many transaction(in your phone or the address you used to take payments from customers) of bitcoin like 10 to 20 transaction then how would you figure out that the women had paid you payment or not, because that time the bitcoin price was different and now is different , and seeing only address doesn't tell you name of the person or face of the person.

If you have a web platform offering customers certain products or services, then you need to somehow register their purchases and transactions. You ask them to create an account on your platform, where they provide all the necessary information for successful delivery. When the account is created and added to your database, you can start tracking all bitcoin addresses requested by this account, and you can verify that a particular purchase was indeed made from a given account. What is worth pointing out is that you want all accounts to have only unique addresses to be able to effectively distinguish purchase sources. Even if the address is not used or accidentally skipped by a customer, it anyway should be associated only with a single account.

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[Nwada001]

Just as you mentioned in your op, depending on what each person purchases, you should also have a sales book that records the exact amount of purchase and means of payment. That being said, even with the change in Bitcoin price, you can still track who has paid and who has not paid you. Just track your wallet through any supported Bitcoin explorer, and all successful transactions will be shown there. And if the payer is arguing that she has sent the payment, then you should request a TX ID from her to prove if she has paid or not. 

[tranthidung]

Use different receiving addresses for different customers as I wrote here and guide from nc50lc to get QR code with Electrum wallet on Desktop and Mobile.

If you have yet felt clear about that, let's see the screenshots.

Above is how the wallet looks like after I assign three receiving addresses for 3 customers from Customer1 to Customer3 and how you can get QR code.

If you set up each address with a specific amount for one customer, tap on URI to get the QR code for that customer. If you get QR code by tapping on Address, that user will have to type amount by himself.

Bitcoin URI Protocol Scheme

One note for OP.

If you want to be safe, after a while of using your first wallet to receive BTC from customers, you can consolidate their inputs and send them all to a new wallet that you won't expose it to the Internet and customers too often. Use that second wallet like your company treasury wallet (if better, use a multi-signature wallet for it).

It's similar to how centralized exchanges move customer deposits from their Hot wallets to their Cold wallets.