Art. 59 CISG
The buyer must pay the price on the date fixed by or determinable from the contract and this Convention without the need for any request or compliance with any formality on the part of the seller.
The Secretariat Commentary on Art. 55 of the 1978 New York Draft, predecessor to Art. 59 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
Overview of case law on Art. 59 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.