feat：获取用户by openid

src/Buyer/Lib/AgentInterface.php

@@ -12,6 +12,8 @@ interface AgentInterface
 {
 	public function getByUnionId(string $unionId, int $storeId);
 
+	public function getByOpenId(string $openId, int $storeId);
+
 	/**
 	 * 代理是否可用
 	 * @param int $storeId
@@ -19,4 +21,5 @@ interface AgentInterface
 	 * @return bool
 	 */
 	public function usefulAgent(int $storeId, int $agentId);
+
 }
\ No newline at end of file