Я заблокував платіжну картку в мобільному банкінгу.

Заблокував is the past tense masculine singular form of заблокувати, which is a perfective verb.

That tells you two important things:

• past tense: the action happened already
• perfective aspect: the action was completed

So Я заблокував платіжну картку... means I blocked the card as a finished action.

If you wanted an ongoing or repeated idea, Ukrainian would more likely use the imperfective verb блокувати.

This is mainly a question of aspect:

• заблокував = blocked / has blocked → completed action
• блокував = was blocking, used to block, or sometimes just focuses on the process rather than the result

In this sentence, the completed result matters: the card ended up blocked. That is why заблокував is the natural choice.

Because картку is the accusative case.

The verb заблокувати takes a direct object: you block something.
Here, the thing being blocked is платіжна картка.

• nominative: платіжна картка
• accusative: платіжну картку

Since картка is a feminine animate? No — it is feminine inanimate, but feminine nouns often still change form in the accusative singular.

That is why both words change:

• платіжна → платіжну
• картка → картку

The adjective has to agree with the noun in case, gender, and number.

Since картку is:

• feminine
• singular
• accusative

the adjective must also be feminine singular accusative:

• nominative: платіжна картка
• accusative: платіжну картку

This kind of agreement is a basic feature of Ukrainian grammar.

Because it comes after the preposition в, used here with the locative case to mean in.

So:

• мобільний банкінг = nominative
• в мобільному банкінгу = locative

Both words change:

• мобільний → мобільному
• банкінг → банкінгу

This phrase means something like:

• in mobile banking
• in the mobile banking app/system

depending on context.

In this sentence, в means in / within the environment of mobile banking.

So в мобільному банкінгу suggests that the action was done inside the mobile banking system or app.

Using на would sound less natural here. Ukrainian often uses в for being inside a digital service, system, or interface.

It usually means mobile banking as a service or platform, and in everyday speech it often practically refers to the mobile banking app.

So in this sentence, в мобільному банкінгу most naturally means:

• in the mobile banking app
• through mobile banking

It does not mean physically inside a phone.

Not always. Ukrainian often drops subject pronouns when the verb already makes the subject clear.

So both are possible:

• Я заблокував платіжну картку в мобільному банкінгу.
• Заблокував платіжну картку в мобільному банкінгу.

The version with Я is more explicit and can add:

• emphasis
• clarity
• contrast, as in I blocked it

Since заблокував is masculine singular past tense, the speaker is already understood as I in many contexts.

Then the past tense verb would change to the feminine form:

• Я заблокувала платіжну картку в мобільному банкінгу.

So:

• masculine: заблокував
• feminine: заблокувала

In Ukrainian past tense, the verb agrees with the speaker’s gender in the singular.

Yes. Ukrainian word order is more flexible than English, though the default neutral order here is very natural.

Possible variants include:

• Я заблокував платіжну картку в мобільному банкінгу.
• У мобільному банкінгу я заблокував платіжну картку.
• Платіжну картку я заблокував в мобільному банкінгу.

These all mean roughly the same thing, but the focus changes:

• starting with Я emphasizes the subject
• starting with У мобільному банкінгу emphasizes where/how it was done
• starting with Платіжну картку emphasizes what was blocked

Платіжна картка means payment card. It is a standard and fairly formal term.

Банківська картка means bank card and is also very common.

In many everyday situations, they can refer to the same thing. However:

• платіжна картка focuses on the card as a payment instrument
• банківська картка focuses on its connection to a bank

In normal speech, many people would simply say картка if the context is clear.

Ukrainian has no articles.

So платіжну картку can mean:

• a payment card
• the payment card

The exact meaning depends on context.

English learners often look for a word corresponding to the, but Ukrainian simply does not have one. Definiteness is usually understood from the situation, word order, or previous mention.

Yes. Very often that is the best natural interpretation.

Even though в literally means in, the whole phrase can be understood idiomatically as:

• in the mobile banking app
• via mobile banking
• through mobile banking

So the phrase describes the digital channel or platform used to block the card.