הכחשת העסקה דורשת אימות.

Because הכחשת is the construct form of הכחשה.

In Hebrew, when one noun is linked to another noun in a phrase like X of Y, the first noun often changes form. This is called the construct state (סמיכות).

So:

• הכחשה = a denial / a dispute
• הכחשת העסקה = the denial/dispute of the transaction

A very common pattern is that a feminine noun ending in -ה changes to -ת in construct:

• בדיקה → בדיקת
• בקשה → בקשת
• הכחשה → הכחשת

Because in a construct chain, definiteness is usually shown on the second noun, not the first.

So:

• הכחשת עסקה = denial/dispute of a transaction
• הכחשת העסקה = denial/dispute of the transaction

Even though הכחשת itself does not have ה-, the whole phrase is definite because העסקה is definite.

This is a very important Hebrew pattern.

Here, העסקה means the transaction.

However, unpointed Hebrew spelling can be ambiguous. העסקה can also mean the employment in a different context. Native speakers usually know which meaning is intended from context.

In this sentence, because of words like הכחשת and אימות, the financial/legal meaning transaction is the natural one.

So here the phrase is about a transaction, not about employment.

Literally, הכחשת is connected to the idea of denial. But in real-world usage, especially in banking or credit-card contexts, הכחשת עסקה often means something more like:

• disputing a transaction
• challenging a transaction
• possibly even a charge dispute

So the most natural English wording may be less literal than the Hebrew structure.

Because the subject, הכחשת העסקה, is grammatically feminine singular.

The head noun of the phrase is הכחשה, which is feminine. In Hebrew, present-tense verb forms based on participles agree with the subject in gender and number.

So:

• דורש = masculine singular
• דורשת = feminine singular
• דורשים = masculine plural
• דורשות = feminine plural

Since הכחשת העסקה is feminine singular, Hebrew uses דורשת.

דורשת comes from the verb לדרוש.

In this sentence, it means requires or demands.

So the sentence is expressing a general rule or requirement:
X requires Y.

This form is grammatically a feminine singular present-tense form, but in Hebrew the present tense is also often used for general truths, policies, instructions, and formal statements like this one.

אימות is a fairly formal noun meaning:

• verification
• authentication
• confirmation

The best English choice depends on context.

In a financial or account-security context, it often means something like verification or authentication. So here it suggests that before the transaction dispute can proceed, some kind of checking or identity confirmation is needed.

Yes. That is often the most natural way to say it in English.

Hebrew commonly uses noun phrases where English would prefer a gerund. So:

• הכחשת העסקה דורשת אימות
  can be understood as
  Disputing the transaction requires verification

That is often more natural in English than a very literal version like The denial of the transaction requires verification.

A rough pronunciation is:

hakh-cha-SHAT ha-is-KA do-RE-shet ee-MOOT

A few notes:

• kh is the throaty sound heard in Scottish loch or German Bach
• העסקה here is read as ha-iska when it means the transaction
• דורשת is stressed on the middle syllable: do-RE-shet
• אימות is stressed at the end: ee-MOOT

Transliteration can vary, but that pronunciation will get you very close.