Creating a web form

To simplify I'd suggest sending your customer their record ID or Billing ID, whatever number corresponds to the actual Quick Base record #. Make this prominent in the email they get.

Then on your Decline web form ask for this ID as part of their submission.

You can then update the code on your page to use API_EditRecord action in place of the API_AddRecord and include an input field for the record ID. Defining the input as follows:

<input type="text" id="key" name="key" />

Here is a very rudimentary example where you'll just need to substitute your values:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>     

<body>

<form name=qdbform method=POST onsubmit='return validateForm(this)' encType='multipart/form-data' action=https://yourcompany.quickbase.com/db/yourtableid?act=API_EditRecord&apptoken=xxxxxxxxxx>;
<input type=hidden name=fform value=1>

<div class="sub-heading">Thank you for responding to the email</div><br>
<div><textarea name=_fid_18 rows=6 placeholder="Why are you declining this bill?"></textarea></div>
<br>
<label>If you would like us to follow up, please check this box
  <input type="checkbox" name=_fid_26 value="1">
</label>
<br>
<br>
<div><input type="text" rid="key" name="key" placeholder=" Billing ID" /></td></div>
<br>

<input type=hidden name=rdr value='https://yourcompany.quickbase.com/db/yourdbid?a=dbpage&pageID=X'>;
<input class="button" type=submit value=Submit>
</div>
</form>

</body>
</html>

You post helped me debug my HTML page.

Thanks.

For some reason the rdr does not redirect to a webpage I am directing it to. Instead it only goes to quickbase pages. 

Any workaround?

Thanks

Sadly that is the case. I think I even opened a ticket with QB support to ask what I was doing wrong.

The workaround I used (and what they suggested) was to redirect to another quickbase code page and put a button on that page that will send them to where you want them to go.

For my web form I have a "Thank You" page with a "please click here" button that takes the user to an opt-in form. It's not a very elegant solution, but it works.

You can check it out here if you like: https://www.quickbasejunkie.com/p/courses-learn-more

Here's the code too:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<base target="_parent">
<style>
.button {
  width: 50%;
  font-size: 18px;
  line-height: 1.6;
  margin: 0 auto;
  text-decoration: none;
  text-align: center;
  padding: 0.9rem 1.1rem;
  border-radius: 2px;
  border: 2px solid #FFA6B6;
  background-color: white;
  color: #FFA6B6;
  font-family: Arial;
  font-weight: 300;
}
.sub-heading{
  font-size: 20px;
  font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
  color: white;
  text-align: center;
  line-height: 1.6;
}
</style>
</head>    
<body>
<p></p>
<p></p>
<p></p>
<div class="sub-heading">Thank You!</div><br>
<a href="https://www.quickbasejunkie.com/p/input-thank-you"; style="margin:auto; text-align:center; display:block;" class="button">Please Click Here</a>

</body>
</html>