Third Party Transactions problem

It is complex and my solution is simple. Delivery address can be the one who places the order, debtor will be the one who receives the invoice. The problem is the auditing procedure where I am not familiar with the following: Can we accept payments from a different bank account from invoice company? Guess not because company is registered in our software with GST number and bank account. So you have to request them to make the payment from the same company who is receiving your invoice. Or else check the Invoicing act, find out if your allowed to mention two company names on an invoice and proceed with the payments.

Others please express your opinions here. 

If it is sales receipt on sales like at a petrol depot or retail stores, you don't have to worry at all. If they are debtors(Pending in payments), then they are regular customers and you can report day sales in day books, and receivables on the name of the person who took the fuel from you. He is liable to pay you because your contract with the customer has a binding agreement with him only. 

Ram a/c 1000

To Sales a/c 1000

(Sold 10 litres of fuel to him) 

By month end or year end, you will be liable to report only Ram's outstanding balances.

Sorry, forgot to mention, your bill issued can be paid by anyone and from any account because your sales and bank will tally exactly the same.