upload nifi template using curl command

[#1]

If you looking to upload template using NIFI REST API, below command curl command upload the template as multipart form post

curl -XPOST -H "Authorization: Bearer {{ token }}" https://localhost:9091/nifi-api/process-groups/10c263d0-0160-1000-0000-00006a157654/templates/upload -k -v -F template=@NifiTemplate.xml

[#2]

We have NIFI Secure S2S enabled.

How do we get the {{ token }}, as NIFI is not enabled for Username / Password, we only use CERTS / PEM files?