A List Apart has a great article on streamlining client contract signing process and using PHP as an alternative paper and pen.
As competition strengthens, every step is vital in making or breaking a deal. Because clients expect everything to be faster, better, and simpler, web professionals must take an instant, foolproof, paperless, modern approach to how clients approve proposals and sign contracts. These documents speak volumes: After all, they are often your first chance to showcase your approach to doing business. I have a way to allow clients to submit legally binding signatures through a web page or PDF file—preserving the classic “signature” aspect while eliminating the most archaic requirements of many modern proposals and contracts. Let’s see how it works.
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A LIST APART – Letting Go of John Hancock