psuedo code

/**
 * create a spending transaction with the parameters,
 * sign it and send it. Return txID or ERROR:
 * @param {*} toAddress 
 * @param {*} amount 
 * @param {*} key 
 */
function sendSignedTransction(toAddress,amount,key){
  // determine fee
  // create a signed transcation
  // send it
  // if success return txID
  // if error return "ERROR:" + error.message
  // if there's common mistakes here, document what they are and how to handle them
}

/**
 * Gets the balance of a wallet given it's key or address
 * @param {*} key private key of wallet
 */
function getBalance(key){
//return some balance from the blockchain (or is a blockchain explorer better for this?)
}

/**
 * Make a payment with the following
 * @param {*} toAddress
 * @param {*} amount 
 * @param {*} key, private key for sending wallet
 */
function MakePayment(toAddress, amount, key){
  var network = testing// choose test chain or mainchain
// get the balance of the sending wallet
  const sendingBalance = getBalance(key)
  if(amount<sendingBalance){
    // send it
    tx = sendSignedTransction(toAddress,amount,key)
    // on confirmation
    if(tx.search("ERROR"<0) ){
      txLink = "https://mempool.space/tx/" + tx
      console.log(`Payment Sent:{txLink}`)
    } else{
      console.log(tx)
    }
  } else{
    console.log(`Balance too low, balance: ${sendingBalance}, payment: ${amount}`)
  }

  MakePayment(testAddress, testAmount, testKey)
  // export MakePayment function to make it public
}