class-gf-webhooks.php

<?php

// put the code from this section into the if/else below around line 615
// if ( in_array( $request_method, array( 'GET', 'DELETE' ) ) && ! empty( $request_data ) ) {

// this garbage code will make their API work
		if ( $request_method === 'GET' && 'json' === $feed['meta']['requestFormat'] ) {

			// Add content type header.
			$request_headers['Content-Type'] = 'application/json';

			// Encode request data.
			$request_data = urlencode(json_encode( $request_data ));

            file_put_contents(__DIR__ . '/log.log', $request_url . $request_data);

            $request_url = $request_url . $request_data;

            // otherwise do what the plugin is supposed to do
		} else {

            // If this is a GET or DELETE request, add request data to request URL.
            if ( in_array( $request_method, array( 'GET', 'DELETE' ) ) && ! empty( $request_data ) ) {
                $request_url = add_query_arg( $request_data, $request_url );
            }

            // If this is a PUT or POST request, format request data.
            if ( in_array( $request_method, array( 'POST', 'PUT' ) ) && 'json' === $feed['meta']['requestFormat'] ) {

                // Add content type header.
                $request_headers['Content-Type'] = 'application/json';

                // Encode request data.
                $request_data = json_encode( $request_data );

            }
        }