You can use the following template tag to manually create a Snaptcha field (not required for supported add-ons):
Creates a Snaptcha field with the security level in the extension settings
Creates a Snaptcha field with the security level specified (1=low, 2=medium, 3=high)
If you have a situation where you are using the Snaptcha field multiple times in the same template then you should give each tag a unique identifier.
If your forms use AJAX to submit data then you must ensure that the Snaptcha field and its corresponding value is submitted as well.