Defined quotation
Reference, version, amount, currency and validity.
PAYMENT GUIDE
After accepting a quotation, request payment instructions through the contact route named in it, and verify the beneficiary and reference before a transfer.

Reference, version, amount, currency and validity.
Acceptance applies to that quotation version only.
Request instructions through the contact route stated in the formal quotation.
Reference, amount, currency and receipt.
Uploading a receipt is not payment confirmation.