Bitpay\Client\Client::createPayout PHP Method

    public function createPayout(PayoutInterface $payout)
    {
        $request = $this->createNewRequest();
        $request->setMethod($request::METHOD_POST);
        $request->setPath('payouts');
        $amount = $payout->getAmount();
        $currency = $payout->getCurrency();
        $effectiveDate = $payout->getEffectiveDate();
        $token = $payout->getToken();
        $body = array('token' => $token->getToken(), 'amount' => $amount, 'currency' => $currency->getCode(), 'instructions' => array(), 'effectiveDate' => $effectiveDate, 'pricingMethod' => $payout->getPricingMethod(), 'guid' => Util::guid(), 'nonce' => Util::nonce());
        // Optional
        foreach (array('reference', 'notificationURL', 'notificationEmail') as $value) {
            $function = 'get' . ucfirst($value);
            if ($payout->{$function}() != null) {
                $body[$value] = $payout->{$function}();
            }
        }
        // Add instructions
        foreach ($payout->getInstructions() as $instruction) {
            $body['instructions'][] = array('label' => $instruction->getLabel(), 'address' => $instruction->getAddress(), 'amount' => $instruction->getAmount());
        }
        $request->setBody(json_encode($body));
        $this->addIdentityHeader($request);
        $this->addSignatureHeader($request);
        $this->request = $request;
        $this->response = $this->sendRequest($request);
        $body = json_decode($this->response->getBody(), true);
        $error_message = false;
        $error_message = !empty($body['error']) ? $body['error'] : $error_message;
        $error_message = !empty($body['errors']) ? $body['errors'] : $error_message;
        $error_message = is_array($error_message) ? implode("\n", $error_message) : $error_message;
        if (false !== $error_message) {
            throw new \Exception($error_message);
        }
        $data = $body['data'];
        $payout->setId($data['id'])->setAccountId($data['account'])->setResponseToken($data['token'])->setStatus($data['status']);
        foreach ($data['instructions'] as $c => $instruction) {
            $payout->updateInstruction($c, 'setId', $instruction['id']);
        }
        return $payout;
    }