Not sure about my hook

What does the form post section of the debug email show? Usually unchecked fields aren’t part of the submission, so your negative would never get triggered, and the default $use_submission is true.

You’d probably want to check for yes and return $use…, otherwise return false.

And if you have multiple services you’d want to wrap that in a check for the right $sid.

I update the code block to this, and now it’s always false.

function f3i_conditional_submit($use_this_form, $submission, $sid) {
        if($submission['subscribe']=='Yes') return $use_this_form;
        else return false;
}

Seems like my subscribe checkbox is never validated. And you’re right, it’s not part of the submission.

Where does the $sid value come form?

$sid comes from the numeric index of the service (from the array) corresponding to its order on the page; I can’t remember if it starts at 0 or 1 — https://github.com/zaus/forms-3rdparty-integration/blob/master/forms-3rdparty-integration.php#L422

What’s your debug email look like?

Thanks for your help with this. Here is the output of the debug email with a few items redacted.

*** Service ***
Array
(
    [name] => Cotactology
    [url] => https://server1.emailcampaigns.net/autoadd/?c=<redacted>&
    [forms] => Array
        (
            [0] => cf7_1724
        )

    [success] =>
    [failure] =>
    [timeout] => 10
    [mapping] => Array
        (
            [0] => Array
                (
                    [lbl] => First
                    [src] => first-name
                    [3rd] => first_name
                )

            [1] => Array
                (
                    [lbl] => Last
                    [src] => last-name
                    [3rd] => last_name
                )

            [2] => Array
                (
                    [lbl] => Email
                    [src] => your-email
                    [3rd] => email
                )

            [3] => Array
                (
                    [val] => 1
                    [lbl] => lid
                    [src] => 2
                    [3rd] => lid
                )

            [4] => Array
                (
                    [lbl] => subscribe
                    [src] => subscribe
                    [3rd] =>
                )

        )

    [separator] => ,
)

*** Post (Form) ***
https://<redacted>/get-in-touch/
Array
(
    [_wpcf7] => 1724
    [_wpcf7_version] => 4.1.1
    [_wpcf7_locale] => en_US
    [_wpcf7_unit_tag] => wpcf7-f1724-p24-o1
    [_wpnonce] => 0dabc0945f
    [first-name] => <redacted>
    [last-name] => <redacted>
    [your-email] => <redacted>
    [your-message] => <redacted>
    [your-source] => Friend or Colleague
    [subscribe] => Array
        (
            [0] => Yes
        )

    [_wpcf7_is_ajax_call] => 1
)

*** Post (to Service) ***
Array
(
    [timeout] => 10
    [body] => Array
        (
            [first_name] => <redacted>
            [last_name] => <redacted>
            [email] => <redacted>
            [lid] => 2
            [] => Yes
        )

)

*** Response ***
Array
(
    [headers] => Array
        (
            [x-powered-by] => PHP/5.2.10
            [set-cookie] => Array
                (
                    [0] => PHPSESSID=adac02c13a9c824b5a15fca2e8a76153; path=/
                    [1] => lang=en; path=/
                )

            [expires] => Thu, 19 Nov 1981 08:52:00 GMT
            [cache-control] => no-store, no-cache, must-revalidate, post-check=0, pre-check=0
            [pragma] => no-cache
            [content-encoding] => deflate
            [vary] => Accept-Encoding
            [content-type] => text/html; charset=UTF-8
            [date] => Fri, 24 Apr 2015 20:04:02 GMT
            [server] => lighttpd/1.4.28
        )

    [body] => DB_DataObject Error: No database name / dsn found anywhere

    [response] => Array
        (
            [code] => 200
            [message] => OK
        )

    [cookies] => Array
        (
            [0] => WP_Http_Cookie Object
                (
                    [name] => PHPSESSID
                    [value] => adac02c13a9c824b5a15fca2e8a76153
                    [expires] =>
                    [path] => /
                    [domain] => server1.emailcampaigns.net
                )

            [1] => WP_Http_Cookie Object
                (
                    [name] => lang
                    [value] => en
                    [expires] =>
                    [path] => /
                    [domain] => server1.emailcampaigns.net
                )

        )

    [filename] =>
)

Ah, there it is — subscribe is an array (weird!). You’ll have to check if($submission['subscribe'][0]=='Yes'), and probably wrap that with some isset if you get php warnings (when it’s not there).

Also, if you’re not planning on sending it, don’t map it. It’ll still be part of the $submission for your hook.

Eureka! It works. Can’t thank you enough.

Here’s the final code block from functions.php :

add_filter('Forms3rdPartyIntegration_use_submission', 'f3i_conditional_submit', 10, 3);

function f3i_conditional_submit($use_this_form, $submission, $sid) {
    // if there was a specific value -- skip
    if(isset($submission['subscribe'][1]) && 'No' == $submission['subscribe'][1]) return false;
    // if there was a specific value -- use
    if(isset($submission['subscribe'][0]) && 'Yes' == $submission['subscribe'][0]) return $use_this_form; 

}

Awesome, glad it worked. You might want a final return $use_this_form; just in case.

Resolving.