Firebase Authentication not working when OneSignal / FCM is used in same project

In that case, I’d like to buy the extension. I’ll make the payment using a credit or debit card. If you prefer, I can also transfer the payment to your Binance account.

I think PayPal provides card option.

I don’t have a PayPal account. I live in Bangladesh, and PayPal is not available here. Also, the link you provided requires logging in to a PayPal account in order to make a payment.