Hello, composer is an additional programm to run on server. Please ask your provider Hostinger. Many Providers do not support it. I'am on all-inkl.com in Germany. Here I have the same problem. It is not alowed to execute composer for customers. You can try to install the sdk manually and get it to run with your own autoloader. I tried it but without success. Some files are missing in the sdk. See my question here: https://www.paypal-community.com/t5/SDKs/Uncaught-Error-Interface-PayPalHttp-Environment-not-found/m-p/2722946#M1236 There are many questions here without any answer. So I think this is not moderated by paypal here. I will changed to stripe, its looks easyer to implement.
... View more