I am using infusionsoft API for email functionality, I don't know how to make a merge filed for to the address I am to send email. This is the API
"https://github.com/infusionsoft/PHP-iSDK"
this is the example given in documentation, but it is not giving any result.
$toAddress = "~Contact.Email~";
How can I make any of my email address's to merge field.