Одноразовый код подтвердит перевод, но не отменит перевод.

Because подтвердить is a perfective verb.

In Russian, perfective verbs do not normally have a true present tense. Their “present-looking” forms actually refer to the future:

• подтвердит = will confirm
• отменит = will cancel

So both verbs here describe single completed actions in the future.

The sentence is about the result of one specific action:

• the code will confirm the transfer
• but it will not cancel the transfer

That is why Russian uses perfective verbs: they focus on a completed outcome.

If you used imperfective verbs instead, the meaning would shift more toward process, repetition, or general ability/habit, which is not the point here.

Одноразовый код is in the nominative singular because it is the subject of the sentence.

Breakdown:

• одноразовый = adjective, masculine singular nominative
• код = noun, masculine singular nominative

They agree with each other in gender, number, and case.

Here перевод is in the accusative singular because it is the direct object of both verbs:

• подтвердит перевод
• не отменит перевод

It is the thing being confirmed or canceled.

Because for inanimate masculine nouns, the accusative singular has the same form as the nominative singular.

So:

• nominative: перевод
• accusative: перевод

That is completely normal in Russian.

Russian could theoretically use a pronoun, but repeating перевод makes the sentence clearer and more formal.

If you replaced the second перевод with его, that could sound ambiguous, because его might make the reader momentarily wonder what it refers to:

• the code?
• the transfer?

In instructions, banking messages, and technical language, Russian often repeats the noun to avoid confusion.

In the second clause, Russian omits код because it is already understood:

• Одноразовый код подтвердит перевод, но не отменит перевод.

English often repeats the subject:

• The one-time code will confirm the transfer, but it will not cancel the transfer.

Russian very often leaves out the repeated subject when it is obvious from the context and the verb form.

Because но means but and connects two clauses:

• код подтвердит перевод
• не отменит перевод

In Russian, a comma is normally used before но when it joins two clauses like this.

Одноразовый means one-time, single-use, or for one use only.

Grammatically, it is an adjective modifying код:

• одноразовый код = a one-time code

It agrees with код in:

• gender: masculine
• number: singular
• case: nominative

This is standard adjective-noun agreement in Russian.

After negation, Russian sometimes allows either accusative or genitive, but in modern standard Russian the accusative is very common when the object is specific and concrete.

Here the sentence refers to a particular transfer, so не отменит перевод sounds natural and standard.

Using genitive here would be less neutral and would not be the most expected form in this kind of practical message.

This word order is the most neutral and natural for this kind of sentence:

• Одноразовый код подтвердит перевод, но не отменит перевод.

Russian word order is more flexible than English, but changing it usually changes the emphasis.

For example, moving перевод or код elsewhere could sound more marked, contrastive, or less natural in a banking/instructional context. The original order is straightforward and clear.