Security Considerations

While developing cross-chain applications using Router's CrossTalk library, there are certain security requirements that need to be adhered to in order to ensure secure cross-chain communication:
Ensure that the setup of the linker address and the fee token address is under the control of the owner. 
Ensure that the sync functions within the contract have the isSelf Modifier set.
Ensure that _routerSyncHandler has addressed all the sync functions.
Ensure that the correct amount of gas is specified in routerSend functions.
Ensure that the source contract address has enough amount of fee token balance and has given the required spending approval to the generic handler. 
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