You just can't accept multi-currency payments if the exchange rate is not stable.
Nowadays Bitcoin is too volatile even for the purpose of being used as a payment method.
Emphasizing/exaggerating it: you work your day at morning for Bitcoins, but you don't know if you can afford dinner at evening, or buy a new car.
That's not just Bitcoin, which is just the best fit as an example, it is a problem of multi-currency. Nowadays, fiat currencies are decently stable each other. Cryptos that are stable with fiat currencies (stablecoins!!) exist, so they are not such of a problem.
But think about inflational and better hyper inflational currencies, of which history has examples. If your purpose is to convert the alternate coin other than spending it for your living, you better not accept alternate currencies.
You do always have two option: one is to accept the payment in any other currency giving the payer the duty to check the exchange rate. Nothing different from cyber extortionist to ask you "send us any amount of Bitcoins worth 1000$ at the time you buy them". In this case the price is set to one currency (dollars?) and both parties suffer rate risk.
In the latter case, you compute your own due amounts at your desired exchange rate, but the value worth can change significantly over time.
What I am going to say with this answer is, even if the exchange rate between
Indian Rupee and
Czech Koruna is oscillating, you know very well how many Pilsens you'll be drinking after your job.
With oscillating cryptos, we all need to establish an economy where one can buy daily asset with crypto (food, gasoline, probably not utilities bills). By that time, invoices in crypto will gain a lot more sense.
Another point of view of this answer is the market where the alt currency will be spent. In the world of fiat coins, you should also be aware of how and where you will be spending the money. The price of a single commodity (such as... beer) is dramatically and substantially different by country (compare Czechia with Denmark for example).
This assumes you are getting paid for your living, not to accumulate liquid assets. In the example right above, if you get paid in
CZK you buy a certain amount of things in Czechia. But if you get paid the same worth amount in
DKK, you'll find it harder to buy things in Denmark.
This ends with a new question then: how are you going to use your crypto assets? Are you going to buy your living?