Why acceptance is not automatic
Rental companies act within both local law and their own internal policy. A country may formally recognise a licence while a particular supplier still declines it, or asks for an International Driving Permit in addition.
That is why the safest question to ask is not "is this licence valid here" but "will this specific supplier release the car on this licence, on my travel dates".
What usually gets asked for
The original licence
The plastic original is required. A photo, a scan or a copy is not accepted at handover, however clear the image.
An International Driving Permit
Where a licence is not fully duplicated in Latin script, the permit is frequently requested. It has to be valid and presented together with the national licence, never instead of it.
A certified translation
Some suppliers ask for a notarised translation rather than, or in addition to, the permit. This varies by company more than by country.
Payment is a separate question
Document acceptance and payment acceptance are independent. Even where the licence is fine, the card may not be: cards issued by some banks are declined by foreign payment systems.
Check which cards the supplier accepts and how the deposit is taken, so that a document approval does not turn into a payment refusal at the counter.
How to confirm before paying
Ask in writing
Request confirmation by email or chat and keep the reply. A written answer is far more useful than a verbal assurance if the position changes at handover.
Ask about your dates
Rules change. Confirmation given for one month does not automatically hold for the next, so ask specifically about your travel dates.
Carry every document
Bring the national licence, the permit if you have one, the passport and the booking voucher. It costs nothing and removes most of the risk.