Debit note and credit note (foreign goods knowledge 4)

My company's collection process:

Company A buys things from our company. Company A is a borrower. For our company, the charge is an account receivable. My company opened a debit note to Company A. [This is a reminder to pay for Company A. It can be understood as a reminder]. After receiving the debit note, Company A can issue a credit note and return it to our company. After receiving this message, we open invoice to Company.

My company's payment process:

My company buys Company B's stuff, and Company B is a credit. For my company, the fee is an account payable. My company opens credit
Note to Company B and tell Company B that we have paid you so much [wait for my company's payment notice to Company B], here credit
Note is the L/C Letter of Credit. Company B opens invoice to our company after receiving the ticket.