A guide to generating your own custom UUIDs
In order for impressions to be successfully tracked, a unique identifier (UUID) needs to be passed into the key parameter. If a UUID is not passed for each impression it will result in stats discrepancies. In the following example we're creating a UUID following version 4 specifications using some javascript.
Example of JS that can be used to generate a v4 UUID:
function uuid() {
var uuid = "", i, random;
for (i = 0; i < 32; i++) {
random = Math.random() * 16 | 0;
if (i == 8 || i == 12 || i == 16 || i == 20) {
uuid += "-";
}
uuid += (i == 12 ? 4 : (i == 16 ? (random & 3 | 8) : random)).toString(16);
}
return uuid;
}
Example of a v4 UUID generated from the JS above:
2e78a663-bfec-4638-91f9-5a4aa05090e3
We would now be able to insert this UUID value into our key parameter, and the result would look like this:
key=2e78a663-bfec-4638-91f9-5a4aa05090e3
NOTE: the same UUID must always be passed into the key parameter of both the anchor and image tag