Hey @claudiapinillos ,
Welcome to the Shopify Community!
This query has been answered on another community thread which I have shared below:
TIP: If you ever find yourself with PayPal holding your funds you have some steps they recommend to follow here. The better you manage your business, the less likely it is you’ll encounter difficult situations with your payment gateways. Don’t forget that you can eliminate your transaction fees with us by adding Shopify Payments as a gateway (if supported in your country) option for your customers as well.
Let me know how you get on!