...

Click on "Show" button to get the Consumer Key. 

The last, you need to follow taking the two file public key.cer and private key.pem that is created above and follow these two steps below to finish:  

...

+ Copy and paste content file .pem into magenest/xero/etc/certs/magenest.pemNote: the 2 files public key.cer and private key.pem are created after running three commands above.  

...

Configuration

Set up Xero Account Informations 

...