CSR algorithm/size is incorrect.Expected RSA 2048

Question

I am trying to integrate apple pay with braintree. I have followed up the following instructions to enable apple pay in the brain tree. In the first step, if you cl

Answer 1

I don't get it, because it's said You must use the CSR we provide. Do not create a CSR file yourself on braintree website.

And with this CSR file, it's always failed on apple's upload page.

Edit: I finally upload success with follow steps of @anjali-jariwala 's answer. Just in last step, I choose RSA & 2048 as alert requirement.