Use the Bid Engine

The Bid Engine changes your Amazon Ads bids from one table, with a record of everything it does. You filter to the keywords you care about, select rows, adjust the bids, and apply. The same app also holds placement modifiers, campaign daily budgets, pause and enable, and, if your organization advertises on Walmart, Walmart keyword and campaign bids.

Before you start

Sign in once at build.mixshift.ai and open the Bid Engine from there. The first time, MixShift asks you to approve the app. See Sign in once at build.mixshift.ai and open your apps.
Pick an account at the top of the page. The Bid Engine lists the accounts MixShift finds for your organization. If it finds none, the page says "No accounts found" with the reason.
Check the line near the top that says whether writes are on for the account you are in. Writes on means a change you apply goes to Amazon, and the line shows the minimum and maximum bid it holds bids between. Writes off means changes only preview, and what you apply is recorded as a dry run so you can see what would change without changing it.

Your own permissions apply too. If your role is view only, you can look at everything but the controls that send changes stay off, and the Campaigns page tells you "View only: your role cannot change campaigns."

Change bids on keywords

Open Keywords. Filter the table to the keywords you care about, then select the rows you want to change. You can also change every row the current filter matches.
Choose Adjust bid. Pick how to set the new bid: adjust by a percent, adjust by a dollar amount, set to an amount, apply a formula (the new bid is the current bid times a factor plus an amount, kept between a floor and a ceiling you set), or set to the Amazon or MixShift recommendation.
Read the summary in the dialog before you apply. It shows how many bids will change, how many are skipped, and the average new bid, and it lists the rows that are left out and why.
Choose Apply. For a larger batch the Bid Engine asks you to confirm a second time (see the guardrails below). Progress shows in the job tray at the top of the page.

You can also edit a single bid directly in its row.

Guardrails

The guardrails always apply, and each account has its own values on the Settings page.

Minimum and maximum bid. By default bids are held between $0.02 and $5.00. A bid outside the range needs confirmation. For a bulk change you choose what to do with rows that would land outside it: cap them at the limit, override the cap (the override is audited), or skip those rows.
Bulk confirmation. By default a batch of more than 10 bids, or any batch that lowers a bid by more than 30 percent, asks "Change N bids?" and you confirm before it goes out.
Writes off. While writes are off for an account, the confirmation says the changes are simulated and nothing reaches Amazon.

The Bid Engine has no separate approver step. You are the one who confirms, so review the numbers before you apply.

Campaigns and placements

Campaigns. Edit a daily budget, or pause or enable campaigns. Every change goes through three steps: review the list of campaign, field, before and after; preview it, which shows the exact request and what Amazon holds now; then commit. Nothing is sent before you commit, and each committed row shows an audit reference. If Amazon refuses a row, the refusal is shown beside it. With writes off you can still review and preview, but you cannot commit.
Placements. Set placement modifiers, campaign by placement. With writes on, a change goes to Amazon and lands in the Placements change log. Set your target ACOS on the Settings page; placement suggestions step toward it.

Walmart

If your organization advertises on Walmart, the Walmart page works the same way: pick an advertiser, review the keyword bids with their last 30 days of performance, preview a change, and send it. The changes you make are listed there so you can undo them.

The record of every change, and Undo

Bid history. On the Keywords page, History lists every bid change on the account, newest first: when, the keyword, the old and new bid, how it was made, who made it, and whether Amazon confirmed it. Open a single keyword's history from its row. A manual change that Amazon confirmed has an Undo button that puts the earlier bid back.
Change log. The Change log page lists every change sent to Amazon: what it replaced, who caused it, and the answer from Amazon. It has tabs for keywords, placements and campaigns. Dry runs are hidden until you choose Show dry runs too. On the Placements and Campaigns tabs, Undo puts the earlier value back; a campaign undo goes through the same review, preview and commit.

Tell us what is missing

Use Feedback in the bar at the top of any page. A person at MixShift reads every note and replies to you personally. Help in your name menu opens the in-app guide.