Art. 54 CISG

The buyer's obligation to pay the price includes taking such steps and complying with such formalities as may be required under the contract or any laws and regulations to enable payment to be made.

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Secretariat Commentary

The Secretariat Commentary on Art. 50 of the 1978 New York Draft, predecessor to Art. 54 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.

Commentary on the Draft Convention on Contracts for the International Sale of Goods, prepared by the Secretariat (UN Doc. A/CONF.97/5), in: United Nations Conference on Contracts for the International Sale of Goods, Vienna, 10 March – 11 April 1980, Official Records: Documents of the Conference and Summary Records of the Plenary Meetings and of the Meetings of the Main Committees, New York: United Nations (1991), pp. 14 et seq., at p. 45

Overview of case law on Art. 54 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.

2016 UNCITRAL Digest of case law on Art. 54 CISG

Interpretation of Art. 54 CISG: Selected issues discussed in case law

Does the CISG govern the question which currency the payment has to be made in?

no:

Erasteel Commentry v. Ezeta S.A.
Juzgado Nacional de Primera Instancia en lo Comercial No. 26 (National Commercial Court of First Instance No. 26)
Argentina, Nov 2002, CISG-online 4395

As Art. 54 CISG does not expressly address the currency of the payment, this question has to be settled in conformity with the (domestic) law applicable by virtue of the forum's rules of private international law (Art. 7(2) CISG)