
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.

to pay in
To pay money, either regularly or once, into a shared system or fund, e.g. into pension insurance or a communal cash box.
Alle Teammitglieder zahlen monatlich fünf Euro in die Kaffeekasse ein.
All team members pay five euros into the coffee fund each month.
'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 means paying for specific goods, a service, or a debt. Einzahlen means putting money into an account, cash box, or shared system or fund. „Bezahlen“ fits a specific charge, while „einzahlen“ fits money that flows into a system.

Ich muss diesen Monat noch Geld in die gemeinsame Kasse einzahlen.
I still have to put money into the shared cash box this month.
Ich muss den Beitrag für diesen Monat noch bezahlen.
I still have to pay this month's contribution.