支付宝收款码不支持花呗收款，是因为没有开通花呗收款服务。开通花呗收款的方法如下：
1、打开手机支付宝app，点击右下角的“我的”。
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2、进入我的设置页面之后，点击箭头所指的商家服务。
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3、在必备服务里面，选择花呗收钱。
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4、在随后出现的页面里面，点击开启花呗收钱服务，即可进行花呗收款。
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