If the wallet generate P2PK, P2PKH or P2WPKH address i can be 100% sure there's no timelock or other custom condition to spend it. On top of that, there are almost no Bitcoin wallet which support timelock feature.
Pretty much only the Bitcoin Core command-line supports it. Not even their GUI wallet lets you do that.
Merchants should not be accepting time-locked txid's for usual business, and should just refund any that they receive to the original address(es) - though that becomes more complicated if there are multiple inputs and outputs, so it's not automatically clear where the refund should go to. In that case, it's best for the customer to write an email to the merchant with the txid they sent, as for a refund, and supply their address.