use cpi context

programs/descro/src/instructions/complete.rs

@@ -1,5 +1,5 @@
 use anchor_lang::prelude::*;
-use anchor_lang::solana_program::{program::invoke_signed, system_instruction};
+use anchor_lang::system_program::{self, Transfer};
 use crate::state::{EscrowAccount, EscrowState};
 use crate::error::EscrowError;
 
@@ -42,17 +42,16 @@ pub fn handler(ctx: Context<Complete>) -> Result<()> {
     let vault_bump = ctx.accounts.escrow_account.vault_bump;
     let vault_balance = ctx.accounts.vault.to_account_info().lamports();
 
-    invoke_signed(
-        &system_instruction::transfer(
-            ctx.accounts.vault.to_account_info().key,
-            ctx.accounts.seller.to_account_info().key,
-            vault_balance,
+    system_program::transfer(
+        CpiContext::new_with_signer(
+            system_program::ID,
+            Transfer {
+                from: ctx.accounts.vault.to_account_info(),
+                to: ctx.accounts.seller.to_account_info(),
+            },
+            &[&[b"vault", escrow_key.as_ref(), &[vault_bump]]],
         ),
-        &[
-            ctx.accounts.vault.to_account_info(),
-            ctx.accounts.seller.to_account_info(),
-        ],
-        &[&[b"vault", escrow_key.as_ref(), &[vault_bump]]],
+        vault_balance,
     )?;
 
     Ok(())

programs/descro/src/instructions/deposit.rs

@@ -1,5 +1,5 @@
 use anchor_lang::prelude::*;
-use anchor_lang::solana_program::{program::invoke, system_instruction};
+use anchor_lang::system_program::{self, Transfer};
 use crate::state::{EscrowAccount, EscrowState};
 use crate::error::EscrowError;
 
@@ -31,16 +31,15 @@ pub struct Deposit<'info> {
 pub fn handler(ctx: Context<Deposit>) -> Result<()> {
     let amount = ctx.accounts.escrow_account.amount;
 
-    invoke(
-        &system_instruction::transfer(
-            ctx.accounts.buyer.to_account_info().key,
-            ctx.accounts.vault.to_account_info().key,
-            amount,
+    system_program::transfer(
+        CpiContext::new(
+            system_program::ID,
+            Transfer {
+                from: ctx.accounts.buyer.to_account_info(),
+                to: ctx.accounts.vault.to_account_info(),
+            },
         ),
-        &[
-            ctx.accounts.buyer.to_account_info(),
-            ctx.accounts.vault.to_account_info(),
-        ],
+        amount,
     )?;
 
     ctx.accounts.escrow_account.state = EscrowState::Active;

programs/descro/src/instructions/resolve.rs

@@ -1,8 +1,7 @@
 use crate::error::EscrowError;
 use crate::state::{EscrowAccount, EscrowState, Winner};
-use anchor_lang::solana_program::{program::invoke_signed, system_instruction};
-use anchor_lang::system_program::Transfer;
-use anchor_lang::{prelude::*, system_program};
+use anchor_lang::system_program::{self, Transfer};
+use anchor_lang::prelude::*;
 use descro_ext_resolvers::state::Ruling;
 
 #[derive(Accounts)]