use {
    crate::{errors::ErrorCode, state::*},
    anchor_lang::prelude::*,
    anchor_spl::token::{TokenAccount},
  };
  
  pub fn assert_payment_token_account(
    token_account: &Account<TokenAccount>,
    token_manager: &Account<TokenManager>,
    remaining_accounts: &mut std::slice::Iter<AccountInfo>,
  ) -> Result<()> {
    if token_manager.receipt_mint == None {
      if token_account.owner != token_manager.issuer { return Err(error!(ErrorCode::InvalidIssuer))}
    } else {
      let receipt_token_account_info = next_account_info(remaining_accounts)?;
      let receipt_token_account = Account::<TokenAccount>::try_from(receipt_token_account_info)?;
      if !(receipt_token_account.mint == token_manager.receipt_mint.unwrap() && receipt_token_account.amount > 0) { return Err(error!(ErrorCode::InvalidReceiptMint))}
      if receipt_token_account.owner != token_account.owner { return Err(error!(ErrorCode::InvalidReceiptMintOwner))}
    }
    Ok(())
  }