The phrase "to require another certificate" means that someone needs to obtain or have an additional document that proves their qualifications or abilities. Full definition
Most airlines require a certificate of health and proof of vaccination dated no more than 10 days prior to your flight. (lyndenvet.com)
However, it is now expressly stated that the employer can not require a certificate from a doctor or other qualified health practitioner. (labourandemploymentlaw.com)
Employers select resumes mentioning at least a high school diploma, while others also require a certificate or an Associate's Degree. (jobhero.com)