File admin/settings/class-wc-braintree-api-settings.php

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<?php
defined( 'ABSPATH' ) || exit();

/**
 *
 * @since   3.0.0
 * @package Braintree/Admin
 */
if ( ! class_exists( 'WC_Settings_API' ) ) {
    return;
}

class WC_Braintree_API_Settings extends WC_Braintree_Settings_API {

    public function __construct() {
        $this->id        = 'braintree_api';
        $this->tab_title = __( 'API Settings', 'woo-payment-gateway' );
        add_action( 'woocommerce_update_options_checkout_' . $this->id, array( $this, 'process_admin_options' ) );
        parent::__construct();
    }

    public function init_form_fields() {
        $this->form_fields = apply_filters( 'wc_braintree_api_form_fields', include 'api-settings.php' );
    }

    public function process_admin_options() {
        $settings = $this->settings;
        parent::process_admin_options();
        $this->fetch_merchant_accounts( $settings );
    }

    /**
     * Retrieve merchant accounts from the Braintree Gateway if the API keys have changed.
     *
     * @param array $settings
     */
    public function fetch_merchant_accounts( $settings = array() ) {
        $env      = $this->get_option( 'environment' );
        $old_keys = array( $settings["{$env}_public_key"], $settings["{$env}_private_key"], $settings["{$env}_merchant_id"] );
        $new_keys = array( $this->settings["{$env}_public_key"], $this->settings["{$env}_private_key"], $this->settings["{$env}_merchant_id"] );
        $old_hash = implode( '_', $old_keys );
        $new_hash = implode( '_', $new_keys );

        // keys have changed, fetch merchant accounts
        if ( $old_hash !== $new_hash && ! in_array( "", $new_keys, true ) ) {
            braintree()->rest_api->force( true );
            rest_get_server();
            $request = new WP_REST_Request( 'POST', '/wc-braintree/v1/merchant-accounts' );
            $request->add_header( 'Content-Type', 'application/json' );
            $request->set_body_params( array( 'environment' => $env ) );
            rest_do_request( $request );
        }
    }

    /**
     * Returns an array of parameters for use in localization
     *
     * @return array
     */
    public function get_localized_params() {
        return array_merge(
            parent::get_localized_params(),
            array(
                'routes' => array( 'connection_test' => braintree()->rest_api->settings->rest_url() . 'connection-test' ),
            )
        );
    }
}

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