• https://docs.ovh.com/gb/en/customer/first-steps-with-ovh-api/|First steps with OVH API

To work with API first create application: https://eu.api.ovh.com/createApp/ You will receive 2 keys:

1. the application key (AK) - can be publicly shared;
2. secret application key (AS) - keep it secret.

This is just start! Now you need to obtain Consumer key (CK)! To request consumer key you must use AK from previous step, write access rules and set redirection URL. After that you'll receive CK and validation URL. Open validation URL and enter login and password to authorize CK.

Or you can go easy way: https://eu.api.ovh.com/createToken/ - fill NIC handle, password, script name (any), script description (any), Validity Unlimited, Rights:

GET /domain/zone/*
PUT /domain/zone/*
POST /domain/zone/*
DELETE /domain/zone/*

Create keys. After that you'll get AK, AS and CK. Just put them to ACME client (Lego, for example).