Wyłączam płatność zbliżeniową, a potem wpisuję kod BLIK.

Polish often drops subject pronouns when the verb ending already shows who is doing the action.

Here:

• wyłączam = I turn off / I am turning off
• wpisuję = I enter / I am entering

So ja is not needed. You could say Ja wyłączam... only if you want extra emphasis, for example to contrast yourself with someone else.

Polish commonly uses the present tense to describe:

• what someone is doing now
• what someone usually does
• steps in a process

So this sentence sounds like a live description of actions or a habitual procedure.

Also, these are imperfective verbs:

• wyłączać → wyłączam
• wpisywać → wpisuję

If you wanted to stress a single completed future action, you would normally use the perfective forms:

• wyłączę
• wpiszę

For example: Wyłączę płatność zbliżeniową, a potem wpiszę kod BLIK.

The infinitives are:

• wyłączać = to turn off, to disable
• wpisywać = to enter, to type in, to fill in

Their common perfective partners are:

• wyłączyć
• wpisać

This is a very common Polish pattern: learners often need to know both the imperfective and perfective verb.

Because this phrase is the direct object of wyłączam, so it is in the accusative case.

• płatność is a feminine noun.
• The adjective must agree with it in case, gender, and number.

So:

• nominative: płatność zbliżeniowa
• accusative: płatność zbliżeniową

A useful detail: the noun płatność itself does not visibly change here, but the adjective does.

Because many feminine nouns behave like this: the noun can look the same in the nominative and accusative, while the adjective shows the case more clearly.

So:

• nominative: ta płatność zbliżeniowa
• accusative: wyłączam tę płatność zbliżeniową

The case is still accusative, even though płatność stays the same in form.

Both a and i can translate as and, but they are not always used in the same way.

Here a potem sounds very natural for moving to the next step:

• first I do one thing,
• and then I do the next.

I potem is not impossible, but a potem is more idiomatic in this kind of sequence. Polish often uses a to link actions smoothly in narration.

Because a joins two clauses, and each clause has its own finite verb:

• Wyłączam płatność zbliżeniową
• a potem wpisuję kod BLIK

In Polish, a comma is normally used before a when it connects clauses like this.

In Polish, the general noun usually comes first, and the more specific label comes after it.

So:

• kod BLIK = a BLIK code
• literally: code BLIK

This is a normal Polish pattern. English often puts the modifier first, but Polish very often puts the main noun first.

Kod is also a direct object here, because it is the thing being entered: wpisuję kod BLIK.

That means it is in the accusative case. But kod is a masculine inanimate noun, and in the singular its accusative looks the same as its nominative.

So:

• nominative: kod
• accusative: kod

That is why there is no visible change.

In kod BLIK, BLIK stays unchanged. It functions as a fixed name attached to kod.

As a learner, the safest thing is to remember the whole expression:

• wpisać kod BLIK
• wpisywać kod BLIK

You may sometimes hear other forms of BLIK in informal usage, but in this phrase the unchanged form BLIK is standard and natural.

The main stress in Polish is usually on the second-to-last syllable.

So here:

• wy-ŁĄ-czam
• PŁAT-ność zbli-że-NIO-wą
• A PO-tem
• wpi-SU-ję
• kod BLIK

A few helpful pronunciation notes:

• ą is a nasal vowel
• ę is also nasal, though in normal speech it may sound weaker at the end of a word
• cz sounds like English ch in chop
• ż sounds like the s in measure