所需工具：支付宝。
具体步骤如下：
1、首先，我们在手机上找到支付宝，点击打开。
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2、进入支付宝界面后，我们点击底部导航中的“我的”。
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3、在个人中心界面中，我们可以看到有一个“商家服务”，当然如果你没有看到这个菜单项，说明你没有权限。
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4、点击进入商家服务界面后，我们可以看到有一个“花呗收钱”按钮，我们点击。
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5、默认是关闭的，我们需要点击打开开关即可。
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