$username = "[email protected]"
$pwdTxt = Get-Content "C:\\temp\\Stored_Password.txt"
$securePwd = $pwdTxt | ConvertTo-SecureString 
$credObject = New-Object System.Management.Automation.PSCredential -ArgumentList $username, $securePwd
# Now, $credObject is having the credentials stored and you can pass it wherever you want.

## Import Password with AES

$username = "[email protected]"
$AESKey = Get-Content $AESKeyFilePath
$pwdTxt = Get-Content $SecurePwdFilePath
$securePwd = $pwdTxt | ConvertTo-SecureString -Key $AESKey
$credObject = New-Object System.Management.Automation.PSCredential -ArgumentList $username, $securePwd

# Now, $credObject is having the credentials stored with AES Key and you can pass it wherever you want.