Your event URL is located near the middle of the Event Dashboard, below your sales data. Just select the copy icon on the right to copy the link. And though it is unlikely that Bit.ly will be shut down, they are still a middleman. Another consideration is that some countries also restrict what content can be used their TLDs, so if you intend in shortening content that might be in violation of these laws, you'll need to find another TLD. Some ad campaigns may be super profitable, but the unprofitable ones eventually cause you to bleed. In this case, each character in the sequence will be 0, 1, 2, ..., 9, a, b, c, ..., y, z. You can modify these in the ga call if necessary (lines 24 to 26).
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