不可撤销跟单信用证（公开议付）
公开议付（Unrestricted Negotiation）亦称自由议付。凡公开议付信用证，一般来讲在信用证的议付条款中须注明“公开议付”（Free Negotiation）字样。
但有的信用证不载明此字样，而载明“邀请”（Invitation）或“建议”（Order）公开议付条款。
开证银行开立的信用证是通过其承诺条款（Undertaking Clause）或称保证条款来表达其公开议付的功能。
凡信用证中列有如下承诺条款的，皆为公开议付：
1、本银行（开证银行）向出票人、背书人及正当持票人保证，凡依本信用证所列条款开具的汇票，于提交时承担付款责任。
We (Issuing Bank) hereby engage with the drawers, endorsersand bona - fide holders of draft(s) drawn under and in compliancewith the terms of the credit that such draft(s) shall be duly honoured on due presentation and delivery of documents as specified.
2、凡依本信用证条款开具并提示汇票 ，本银行保证对其出票人、背书人和正当持票人于交单时承兑付款。
Provided such drafts are drawn and presented in accordance withthe terms of this credit, we hereby engage with the drawers, endorsers and bona - fide holders that the said drafts shall be duly honoured on presentation.
3、本信用证项下签发的汇票并符合信用证所列条款，则其出票人、背书人、及正当持票人于19＿＿＿＿年＿ 月＿日以前向议付银行提示议付，开证银行保证于提交单据时付清票款。
We hereby agree with the drawers，endorsers and bona-fide holdersof drafts drawn under and in compliance with the terms of this credit that the same shall be duly honoured on due presentation, and negotiated at the Negotiating Bank on or before, 19＿＿＿。
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4、本银行向出票人、背书人及正当持票人表示同意，凡依本信用证所列条款开具的汇票，向本银行提示时。到期即予以付清票款。
We hereby agree with the drawers, endorsers and bona - fide holders of drafts drawn in compliance with the terms of the credit that such drafts shall be duly honoured on presentation and paid at maturity.
邀请公开议付的条款系指开证银行或付款银行作出保证或承诺，凡汇票出票人、背书人或正当持票人，持有按信用证所列条款而签发汇票者，付款银行届时予以付款。此条款系付款银行向持票人发出普遍的、公开的、自由议付的书面邀请。凡开具公开议付信用证的银行，一般来讲系信誉好，手续简便，银行费用较低的银行。
