wikimedia/mediawiki-extensions-DonationInterface

<?php

class AmazonBillingApi extends DonationApiBase {
    protected $allowedParams = [
        'amount',
        'billingAgreementId',
        'currency',
        'orderReferenceId',
        'recurring',
        'wmf_token',
    ];

    public function execute() {
        $this->gateway = 'amazon';
        DonationInterface::setSmashPigProvider( 'amazon' );
        $output = $this->getResult();
        $recurring = $this->getParameter( 'recurring' );
        $token = $this->getParameter( 'wmf_token' );
        $adapterParams = [
            'external_data' => [
                'amount' => $this->getParameter( 'amount' ),
                'currency' => $this->getParameter( 'currency' ),
                'recurring' => $recurring,
                'wmf_token' => $token,
            ],
        ];

        $adapterClass = DonationInterface::getAdapterClassForGateway( 'amazon' );
        // @var AmazonAdapter
        $this->adapter = new $adapterClass( $adapterParams );

        if ( $this->adapter->getErrorState()->hasErrors() ) {
            $output->addValue(
                null,
                'errors',
                $this->serializeErrors(
                    $this->adapter->getErrorState()->getErrors()
                )
            );
        } elseif ( $token && $this->adapter->checkTokens() ) {
            if ( $recurring ) {
                $this->adapter->addRequestData( [
                    'subscr_id' => $this->getParameter( 'billingAgreementId' ),
                ] );
            } else {
                $this->adapter->addRequestData( [
                    'order_reference_id' => $this->getParameter( 'orderReferenceId' ),
                ] );
            }
            $result = $this->adapter->doPayment();
            if ( $result->isFailed() ) {
                $failPage = GatewayChooser::buildGatewayPageUrl(
                    'amazon',
                    [ 'showError' => true ],
                    $this->getConfig()
                );
                $output->addvalue(
                    null,
                    'redirect',
                    $failPage
                );
            } elseif ( $result->getRefresh() ) {
                $output->addValue(
                    null,
                    'errors',
                    $this->serializeErrors( $result->getErrors() )
                );
            } else {
                $output->addValue(
                    null,
                    'redirect',
                    ResultPages::getThankYouPage( $this->adapter )
                );
            }
        } else {
            // Don't let people continue if they failed a token check!
            $output->addValue(
                null,
                'errors',
                [ 'token-mismatch' => $this->msg( 'donate_interface-cc-token-expired' )->text() ]
            );
        }
    }

    public function getAllowedParams() {
        $params = [];
        foreach ( $this->allowedParams as $param ) {
            $params[$param] = null;
        }
        return $params;
    }
}