Store_Api::getCustomerLoginToken( $id, string $redirectUrl = '', string $requestIp = '', int $channel_id )

	public function getCustomerLoginToken( $id, $redirectUrl = '', $requestIp = '', $channel_id = 0 ) {
		$config     = $this->apiClient->getConfig();
		$client_id  = $config->getClientId();
		$secret     = $config->getClientSecret();
		$store_hash = $this->get_store_hash();
		if ( empty( $secret ) ) {
			throw new \Exception( 'Cannot sign customer login tokens without a client secret' );
		}

		$payload = [
			'iss'         => $client_id,
			'iat'         => $this->get_server_time(),
			'jti'         => bin2hex( random_bytes( 32 ) ),
			'operation'   => 'customer_login',
			'store_hash'  => $store_hash,
			'customer_id' => $id,
		];

		if ( ! empty( $redirectUrl ) ) {
			$payload[ 'redirect_to' ] = $redirectUrl;
		}

		if ( ! empty( $requestIp ) ) {
			$payload[ 'request_ip' ] = $requestIp;
		}

		if ( ! empty( $channel_id ) ) {
			$payload[ 'channel_id' ] = (int) $channel_id;
		}

		return JWT::encode( $payload, $secret, 'HS256' );
	}