einzahlen
to deposit
To put money into a bank account, savings account, or cash register.
Ich gehe kurz zur Bank, um die Einnahmen von gestern einzuzahlen.
I'm quickly going to the bank to deposit yesterday's takings.

to deposit / pay in
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to deposit
To put money into a bank account, savings account, or cash register.
Ich gehe kurz zur Bank, um die Einnahmen von gestern einzuzahlen.
I'm quickly going to the bank to deposit yesterday's takings.

'Einzahlen' (to deposit/pay in) is a separable verb. The prefix 'ein-' comes at the end in a main clause, stays attached to the verb in a subordinate clause, and in the infinitive with 'zu', 'zu' goes in the middle.
Ich zahle heute 100 Euro auf mein Konto ein.
I am depositing 100 euros into my account today.
The verb is made up of the prefix 'ein-' and the verb 'zahlen' (to pay). The prefix 'ein-' here means 'into,' so literally 'to pay into something.'
Können Sie mir helfen, Geld am Automaten einzuzahlen?
Can you help me deposit money at the ATM?
The destination of the deposit is usually given with the prepositions 'auf' or 'in' and the accusative. You deposit money 'auf ein Konto' (into an account) or pay it 'in eine Kasse' (into a cash box/fund).
Er muss das Geld auf sein Sparkonto einzahlen.
He has to deposit the money into his savings account.
In a banking context, 'einzahlen' (to deposit) is often used with 'Bargeld' (cash), 'Geld' (money), or 'einen Scheck' (a check) as the object. You can deposit money at a bank or at an ATM.
Ich möchte bitte dieses Bargeld auf mein Girokonto einzahlen.
I would like to deposit this cash into my checking account, please.
to pay
'bezahlen' and 'einzahlen' both have to do with money, but the direction and purpose are different. You use 'bezahlen' when you give money for something, for example for goods, a bill, or a service. You use 'einzahlen' when you put money into an account, a cash box, or a shared system. Learners may confuse the words because in both cases money is given away. The simple way to think about it is: you 'bezahlt' something that you buy or owe. You 'zahlt Geld ein' when it is being collected or stored somewhere.

Nele zahlt jeden Monat Geld in die Gemeinschaftskasse ein.
Nele pays money into the communal cash box every month.
Nora bezahlt morgen die Rechnung für den Handwerker.
Nora will pay the bill for the tradesman tomorrow.