Paypal will do first tier verification at $2500 total revenue.
They will not take away your ability to receive funds, they will however remove ur ability to send / withdraw funds. You'll still have the ability to refund.
At this stage they'll ask you to link your Creditcard and in most cases verify u'r identity again or for the first time. They might also ask for proof of residency (utility bill).
Paypal will do second tier verification at $10.000 total revenue
They will not take away your ability to receive funds, they will however remove ur ability to send / withdraw funds. You'll still have︀ the ability to refund.
At this stage they'll ask you to link a bank account,︁ ask details about source of funds coming in, ask basic details about your business and︂ they might reask you to verify your identity
Keep in mind Paypal also has the︃ 30 day hold limit where funds get put "on hold" in your account for 30︄ days and you can't spend / withdraw these funds. The limit is mostly lifted after︅ 3 months.
Very important that new Paypal accounts will quickly notice that accepting huge revenue︆ is pointless.
If you for example receive a $500 payment, that's all good but you︇ wont be able to send payments to other Paypal account for the first few weeks.︈ Only being able to send really small amounts every few days.