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TrackPlay tags every ElasticFunnels checkout link on your page with the viewer’s session, carried on vtid. ElasticFunnels posts each sale back with that value attached, and TrackPlay joins it to the play that produced it.

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Connect it

The parameter to pick is vtid, which is already selected for you. Change it only if you use vtid for something else.

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Set up the postback URL

Copy the URL from the Postback Setup window. In ElasticFunnels, go to Settings → Merchants, pick your merchant, click Edit, and open the Postback URLs tab. Paste the URL in and tick Enabled. Then push a test sale. The status flips from Not configured to Active the moment the first postback lands.
Your postback URL is a secret. Anyone holding it can post fake conversions into your workspace. Give it to ElasticFunnels and nobody else.

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Signing secret

ElasticFunnels signs every postback it sends. Paste the signing secret from that same Postback URLs tab into TrackPlay and each delivery is checked against the signature before it is accepted, so nobody who guesses your URL can write a sale into your account. The secret is optional. Leave it blank and your postbacks still land, with the URL itself as the only protection. Fill it in if you can: ElasticFunnels shows the secret once, so copy it when you first set the postback up.
ElasticFunnels lets you rotate the signing secret at any time. If you do, paste the new one into TrackPlay in the same sitting. Postbacks signed with a secret TrackPlay does not have are rejected.

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Which events are recorded

Refunds and chargebacks come through with a negative amount from ElasticFunnels. TrackPlay records the gross amount and marks the row as a refund, so your revenue reporting nets out correctly without any double negatives. Everything else ElasticFunnels can send is acknowledged and not recorded, because none of it is money moving: abandon, shipped, failed_payment, subscription_change and subscription_renewal_failed. A plan upgrade or downgrade is not counted; the renewal that follows it reports the new amount by itself. Test sends and sandbox merchants are flagged as test conversions, so they never reach your real revenue numbers. Every link and form pointing at an ElasticFunnels checkout (the /b?p= pattern) gets the parameter added automatically.
ElasticFunnels links are the one case where TrackPlay does not also append its own tp_ck key. vtid already carries everything needed to attribute the sale, so the checkout URL stays as short as it can be.

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When it does not work

No postback has arrived yet. Check the URL is saved in the Postback URLs tab, that Enabled is ticked, and push a real test sale.
The signing secret does not match. Re-copy it from ElasticFunnels (a trailing space is enough to break it) and save again. Deliveries older than five minutes are also rejected, which normally means a clock problem rather than a wrong secret.
The link was not tagged. Confirm your buy button points at a /b?p= checkout URL and that no redirect in between is stripping the query string. A sale made from a link you built by hand, or an organic one, has no session to join to and will show up unattributed.
ElasticFunnels retries a failed delivery on a 1m → 5m → 30m → 2h → 12h schedule and then marks it dead. You can re-queue it from its own delivery log once the cause is fixed.