Never heard about zencart how did you implement it to your webshop?
What CMS you are using is it WordPress?
The website of ZenCart looks dead because I can't access the website: zen-cart.com
https://www.zen-cart.com/ - You can't access this link? I just googled Zencart and was able to check their website, and it looks like the same thing OP is talking about (a payment processor).
and then i see the transaction its confirmed in blockchain explorer.
but i dont received any BTC in my electrum bitcoin wallet
If the transaction is confirmed on a blockchain explorer (for example, blockchain.info), it's likely an issue with your electrum wallet. Make sure you check the address so it's the same as the electrum one, and you should either restart your wallet, or re-sync it. If this still doesn't work, import the seed into another wallet (mycelium for mobile works).
A better alternative now is to use
https://btcpayserver.org/ it is all open source and doesn`t require KYC.
Bitpay is now demanding KYC for customers and merchants.
OP, you should avoid those shady services such as zencart (never heard of).
Can you past the transaction ID, or the public address? So we can track if it is already confirmed or not. It may be a wallet bug, not syncing.
Great recommendations, Bitpay has recently added mandatory KYC for transactions over 2,000 USD, so if your store is selling expensive items, it'll be better to go with the open-source payment processor, or deal with the KYC issues and pick the mainstream one.