两者的区别的：
银联在线支付，是走银联渠道的在线支付功能，每次支付都需要提供卡号，密码等信息，通过银联的网站来实现支付，使用的银行卡无需开通网银；
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快捷支付是指微信支付，京东快捷支付等第三方支付公司提供的支付功能，是走的和银行直连的渠道，第一次绑定需要效验卡号，预留手机号等信息，之后的之后仅需要支付密码即可完成支付
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参考资料：/static.95516.com/static/product/detail_269.html"target="_blank">
https://static.95516.com/static/product/detail_269.html（银联官方网站在线支付）