The 13-week forecast

                         WK 1   WK 2   WK 3  ...  WK 13
OPENING CASH
CASH IN
  Payouts: Shopify Payments   (forecast sales, shifted by lag)
  Payouts: PayPal
  Payouts: BNPL providers
  Preorder and gift card cash
  Wholesale receipts
  Financing drawn
CASH OUT
  PO deposits                 (one line per open PO)
  PO balances                 (one line per open PO)
  Freight and duties
  Payroll
  Ad spend                    (on each platform's billing schedule)
  3PL, software, rent
  Sales tax, income tax
  Loan and advance repayments
  Refunds, incl. preorders
CLOSING CASH
FLOOR                         (4 weeks of fixed costs + preorder reserve)
ABOVE / BELOW FLOOR
LAST WEEK'S FORECAST FOR THIS WEEK, AND THE DIFFERENCE

Asking a supplier for better terms

SUBJECT   Forecast for the Next Six Months, and a Request on Terms

Hi [name],

Attached is our rolling six-month forecast for [products]. The
next two months are firm; the rest is our best estimate, and
we'll update it on the first of each month.

We've grown [x]% with you over the last [period] and paid every
invoice on its due date. As we plan the next year, we'd like to
ask for one change: [balance paid on arrival rather than at
shipment / a 20% deposit instead of 30% / net 30 from arrival /
the 6,000-unit price on a 6,000-unit commitment, released and
paid in three lots of 2,000].

In return we can offer [a 12-month volume commitment of x units
/ the monthly forecast / confirming materials earlier /
consolidating [product] with you].

Could we talk this week or next?

[name]

This is a business letter to a supplier, not marketing, so it doesn’t need an unsubscribe line.

Preorder product page

PREORDER: SHIPS BY [DATE]
You'll be charged [in full / a $[x] deposit] today[, and the
balance when your order ships]. We expect to ship by [date]. If
that changes, we'll email you before then with a new date, and
you can cancel for a full refund at any time before it ships.
Orders with in-stock items ship [together when the preorder
ships / separately].

State only a date your supplier has confirmed in writing (chapter 7). Have counsel review.

First access for existing customers: email

SUBJECT   You're First: [Product] Preorders Open Today
PREVIEW   48 hours before anyone else, at the best price we'll offer

[First name], [product] is coming in [month], and you get first
access.

For the next 48 hours, preorders are open only to customers, at
$[price], the lowest price it will ever launch at. There are
[number] at this price. After that, it opens to everyone at
$[price 2].

It ships by [date]. You'll be charged [today / a deposit today],
and if the date changes we'll tell you before it does, with the
option of a full refund.

[Preorder now]

[Brand] · [postal address]
You're receiving this because you bought from us.
Unsubscribe: [link]

First access for existing customers: text

[Brand]: [First name], [product] preorders are open to customers
only for 48 hrs, at $[price] (the lowest it'll ever be). Ships by
[date]. [link] Reply STOP to opt out

Send only to customers who’ve given SMS consent, within quiet hours for their time zone.

The delay notice

SUBJECT   An Update on Your [Product] Preorder, Order #[number]
PREVIEW   new ship date, and your options

Hi [first name],

We promised to ship your [product] by [original date]. We won't
make that date, because [honest, specific reason].

Our new ship date is [revised date]. [OR: We don't yet know the
new date. We'll write again by [date] with an update.]

You have two options:

1. Wait for it. [IF THE NEW DATE IS 30 DAYS OR LESS AFTER THE
   ORIGINAL: If we don't hear from you, we'll take that as a yes
   and ship by [revised date].] [IF MORE THAN 30 DAYS OR NO DATE:
   Please click below to confirm you'd like to wait. If we don't
   hear from you by [date], we'll cancel and refund your order.]
   [Keep my order]

2. Cancel for a full refund, at no cost. [Cancel and refund]
   Refunds go back to your original payment method within seven
   working days.

We're sorry. Thank you for waiting with us.

[name], [Brand]

A required notice under the FTC rule, sent before the original date passes. Keep promotion out of it, and have counsel review the wording.