Below is a concise and easy instruction on how to purchase Kusama from Sri Lanka on the Changelly site:
Please be aware that this may take from a few minutes up to a couple of hours for Kusama to arrive into your crypto wallet. We undertake to transfer your KSM as prompt as possible, but from time to time there are delays because of the following reasons:
- Overload of the blockchain;
- Updates of cryptocurrency;
- DDoS attack.
That's all! Your KSM will be transferred to your wallet asap.