How exactly do Authorized Participants determine the securities to exchange?

Question

Inspired by "How are active ETFs possible?", I wonder about the following:
As part of the regular creation process, Authorized Participants (APs) are supposed to hand in a basket of securities at the fund and get a bunch of ETF shares in turn.
But the ETF doesn't only have the securities listed in the index, it supposedly also has some cash, e. g. from dividends. And it often doesn't have the underlying index components in the ratio defined by the index, but maybe in a different ratio. This might occur in accumulating ETFs when a fund buys slightly more of one security, maybe in order to reinvest the dividends. Or it consists of swap contracts instead of the physical securities.
So how does the AP know how to compose the basket? Are they told that by the fund manager?
The same question holds for an active ETF.

Flux · Accepted Answer

They will be told by the fund manager (the ETF sponsor). I believe the exact process varies slightly by ETF. As usual, all the details will be in the prospectus. Let's take a look at the SPDR S&P 500 ETF Trust (NYSE Arca: SPY). I quote from its prospectus.
What Authorized Participants (APs) need to provide in exchange for newly created ETF units:

Payment for orders is made by deposits with the Trustee of a portfolio of securities, substantially similar in composition and weighting to Index Securities, and a cash payment in an amount equal to the Dividend Equivalent Payment (as defined below), plus or minus the Balancing Amount [...]

Definition of "Dividend Equivalent Payment" and "Portfolio Deposit":

“Dividend Equivalent Payment” is an amount equal, on a per Creation Unit basis, to the dividends on the Portfolio (with ex-dividend dates within the accumulation period), net of expenses and accrued liabilities for such period [...]
[...]
The Dividend Equivalent Payment and the Balancing Amount collectively are referred to as the “Cash Component” and the deposit of a portfolio of securities and the Cash Component collectively are referred to as a “Portfolio Deposit.” Persons placing creation orders must deposit Portfolio Deposit [...]

"So how does the AP know how to compose the basket?":

The Trustee makes available to NSCC before the commencement of trading on each business day that the New York Stock Exchange LLC (the “NYSE”) is open for business (“Business Day”) a list of the names and required number of shares of each of the Index Securities in the current Portfolio Deposit as well as the amount of the Dividend Equivalent Payment for the previous Business Day. The identity and weightings of the Index Securities to be delivered as part of a Portfolio Deposit are determined daily and reflect the relative weighting of the current Index. The value of such Index Securities, together with the Cash Component, is equal to the net asset value of the Trust on a per Creation Unit basis at the close of business on the day of the creation request. The Sponsor makes available every 15 seconds throughout the trading day at the Exchange a number representing, on a per Unit basis, the sum of the Dividend Equivalent Payment effective through and including the previous Business Day, plus the current value of the securities portion of a Portfolio Deposit as in effect on such day (which value occasionally may include a cash-in-lieu amount to compensate for the omission of a particular Index Security from such Portfolio Deposit). [...]

"Are they told that by the fund manager?" Yes.

How exactly do Authorized Participants determine the securities to exchange?

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