1.) Security Concerns: Ensuring the security of the system is paramount. Handling private keys or relying on third parties to pay gas fees introduces security risks. Developers must implement robust security measures, conduct thorough audits, and follow best practices to protect users' funds and data.
2.) Smart Contract Complexity: Implementing account abstraction and gasless transactions may require complex smart contract logic. It's crucial to carefully design and thoroughly test the smart contracts to avoid vulnerabilities and bugs.
3.) Gas Estimation: When someone else pays the gas fees, the developer needs to estimate the appropriate gas cost accurately. Underestimating the gas required could lead to transaction failures, while overestimating could result in wasted funds.
4.) Relayer Management: If a relayer service is used to pay for gas on behalf of users, the developer needs to set up and manage relayers effectively. This involves handling relayer incentives, ensuring uptime, and mitigating potential risks.
5.) Meta-Transaction Relayers: Integrating with meta-transaction relayers or services like the Gas Station Network requires careful coordination and adherence to their protocols. Developers must understand the relayer infrastructure and comply with their requirements.