set_dapp_metadata

• To facilitate cross-chain transactions, it is necessary to cover the fees on the Router Chain. This is achieved using the set_dapp_metadata function available in the Gateway contracts.
• Once the fee_payer_address is set, the designated fee payer must approve the request to act as the fee payer on the Router Chain. Without this approval, dApps will not be able to execute any cross-chain transactions.
• It's important to note that any fee refunds resulting from these transactions will be credited back to the dApp's fee_payer_address on the Router Chain.

Prefix:

pub const GATEWAY_ACCOUNT: &[u8] = b"gateway_account";
pub const DAPP_ACCOUNT: &[u8] = b"dapp_account";

pub fn set_dapp_metadata(
    ctx: Context<SetDappMetadata>,
    fee_payer_address: String,
    program_id: Pubkey,
    program_account_id: Pubkey,
) -> Result<()> 

Parameters:

• fee_payer_address: The account responsible for covering the transaction fees for any cross-chain requests originating from the dApp.
• program_id: The dapp program id for which set_dapp_metadata is done.
• program_account_id: The dapp program account.

Account Context:

#[event_cpi]
#[derive(Accounts)]
pub struct SetDappMetadata<'info> {
    #[account(mut, seeds = [GATEWAY_ACCOUNT], bump = gateway_account.gateway_account_bump)]
    pub gateway_account: Account<'info, GatewayAccount>,
    #[account()]
    pub dapp_signer_account: Signer<'info>,
    #[account(init_if_needed, seeds = [DAPP_ACCOUNT, dapp_signer_account.key.as_ref()], bump, payer = fee_payer_account, space = DISCRIMINATOR_SIZE + DappAccount::INIT_SPACE)]
    pub dapp_account: Account<'info, DappAccount>,
    #[account(mut)]
    pub fee_payer_account: Signer<'info>,
    pub system_program: Program<'info, System>,
}

caution

Without creating dApp accounts via the set_dapp_metadata function, it is not possible to make an i_send call.