Q. Can I automate record registration for dns-01 challenge?
You can achieve automation through the use of DPF-API.
With regard to automation using a tool, lego which is an ACME client corresponds to this service. Refer to "legoのIIJ DNSプラットフォームサービスへの対応について（Japanese only）" in IIJ Engineers Blog for more information.
[ Note ]
Use of lego is not part of the support provided under the IIJ DNS Platform Service. Use the service at your own risk.
Customer Support for this service will not accept inquiries about the use or operation of ACME clients including lego. Please keep that in mind.