Thread: Custom Payment on Advert (Final Value Fee)

Custom Payment on Advert (Final Value Fee)

I'm after some advice... The pricing model I'm going to use for Classipress is free listings with a Final Value fee to obtain contact details for the buyer.
To keep this thread simple, the work has been done to make Classipress work this way, by integrating a moderated user messaging plugin.
We will know when an offer is made and can offer that the seller pays the Final Value Fee to obtain contact details of the buyer.

I need to utilise the Payments API to create a payment against the advert. I've found the code in step 3 and propose to use it on a custom payment page, modifying it:

$order = appthemes_new_order();
$order->add_item( CP_FINAL_VALUE_FEE, $final_value_fee, $post_id ); // Add CP_FINAL_VALUE_FEE to add_theme_support 'app-payments'
do_action( 'appthemes_create_order', $order );

echo html( 'h3', __( 'Payment', APP_TD ) );
echo html( 'p', __( 'Please wait while we redirect you to our payment page.', APP_TD ) );
echo html( 'p', html( 'small', __( '(Click the button below if you are not automatically redirected within 5 seconds.)', APP_TD ) ) );
cp_js_redirect( "Custom thank you Page URL", __( 'Continue to Payment', APP_TD ) );

I'd also have to add support to payments.php with accompanying code to update a custom field Final_Value_Fee_Paid

add_action( 'appthemes_transaction_completed', 'cp_payments_handle_finalvaluefee_completed' );
add_action( 'appthemes_transaction_activated', 'cp_payments_handle_finalvaluefee_activated' );

Am I heading in the right direction? I don't want to start until I'm sure I won't cause problems anywhere else or have missed something.

Many thanks

John