Using PayPal api or web hooks, how can I get the value of subscription optional field filled by user ? I use on0/os0 and on1/os1 like below.
But if I get subscription details I only get subscription ID, status, subscription title at most, but cannot find a way to getch the 2 custom fields filled by user.
If it matters, the subscription button is made by the html code on web site, not a predefined subscription in PayPal account.
<input type="hidden" name="on0" value="user_url">
<input name="os0" type="url" size="70" placeholder="enter your URL" required>
<input type="hidden" name="on1" value="user_url_title">
<input name="os1" type="text" size="70" placeholder="enter your url title" required>
I see PayPal mentions these on1/os1 valiables here but I cannot find much info about them in the API calls.