What is the easiest way to receive payment from a customer in Spain legally?

Question

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I, as an individual in Russia, they, as a company, want to pay legally from their account in Spain. At the moment, what is the easiest way to organize the receipt of money from them? IP would not want to, tk. it’s immediately to get into pension contributions, and this is a significant amount. Is it possible to be self-employed here or up to a certain amount without registering an individual entrepreneur? If they make a payment to my bank according to full details, who can ask me for the receipt of money from a foreign account? Through PayPal if carried out? They have an account linked to it.
Who has this experience?

Answer 1

Through Blackcatcard it would be possible to accept payment. They open an IBAN account. It will be convenient for customers to transfer. Tax, if the payment is not space, I would not shine an account at all.

Answer 2

So far I have resolved the issue through a self-employed person. In alphabank, money is sent to the Euro account, they come in Euro. At the moment of receipt, I look at the exchange rate in the Central Bank and receive the amount for which I write a check to a Foreign Company - it looks just like a regular check.