Custom location for $ACME_DIR for a CA ?

[positiwise]

Hello,

Just wanted to ask if there is any way to have custom location for $ACME_DIR or some other way I can override validation path where the challenge will be updated ? I am asking because I am working on supporting a well known CA (through custom ACME that I am writing), but their validation challenge file path is like http://[domain.name]/.well-known/pki-validation/fileauth.txt instead of usual ACME : /.well-known/acme-challenge/ . Is there any way I can indicate that from custom ACME Server to acme.sh to go through custom file validation path?

[Neilpang]

you can define "ACME_DIR=xxxxx" in the account.conf file.
but I don't think it can help in your case.