Nexus Logic Systems
Shipby Preorder Back in StockA Shopify app by Nexus Logic Systems

Shipby privacy policy

Shipby lets a Shopify store take pre-orders on sold-out products, hold them until the stock arrives, and email shoppers when a product is back in stock. This page says what the app stores, why, where it is kept, for how long, and how it is erased.

Effective October 27, 2026Applies to the Shopify app Shipby Preorder Back in Stock

In short

  • About shoppers, the app stores only email addresses, the shopper's language and what they ordered or asked to be told about. It never stores names, phone numbers, postal addresses or payment card details.
  • Email addresses are used only to send the emails a pre-order or a restock alert needs. The app sends no marketing.
  • We do not sell personal data and do not use it for advertising or profiling. The storefront part of the app sets no cookies.
  • The app and its database run in the United States, on Render and Neon. Emails are sent through Resend.
  • Old data is removed on a schedule, a shopper's data is erased when Shopify asks, and everything stored for a shop is deleted when Shopify asks 48 hours after the app is uninstalled.

Who is responsible

Shipby Preorder Back in Stock ("Shipby", "the app") is made and operated by Nexus Logic Systems, Mostaganem, Algeria ("we", "us"). For any question about this policy, write to support@nexuslogicsystems.com.

Who this policy is for

  • Merchants: shops that install Shipby from the Shopify App Store.
  • Pre-order buyers: people who buy a product from a merchant on pre-order.
  • Back-in-stock sign-ups: people who leave their email address on a sold-out product to be told when it is back.

For the personal data of buyers and sign-ups, the merchant decides why and how the data is used: the merchant is the controller. We handle that data only to provide the app to the merchant, on the merchant's instructions, as the merchant's processor. If you are a shopper and have a question or a request about your data, please contact the shop first. We help the shop answer you.

What the app stores

About pre-order buyers

DataWhy it is stored
Order ID and order numberTo hold the pre-order items of that order and release them, oldest order first, when stock is received.
The pre-ordered itemsProduct variant, quantity, the pre-order offer and the ship-by date the buyer was promised.
Email address and languageTaken from the order, to email the buyer when the pre-order is being prepared, when an incoming-stock date moves, and before a balance is charged.
Balance, when the shop takes depositsThe amount still owed, its currency, when it is due, and the payment status and reference Shopify returns. Shipby never receives card numbers: the balance is charged through Shopify, with the payment method Shopify kept at checkout.

About back-in-stock sign-ups

DataWhy it is stored
Email addressTo send one email when the product is back in stock.
Product and variantSo that the email is about the right item.
LanguageAs reported by the store's page when the shopper signed up.
Marketing choiceWhether the shopper ticked the optional "news and offers" box, when the shop shows it. The choice is passed to the merchant in the export; Shipby itself never sends marketing.
Status and datesWaiting, emailed or unsubscribed, with the dates, so that nobody is emailed twice for one sign-up.
A random unsubscribe codeSo that the link in the email can stop that one sign-up without an account.

About the merchant's shop

DataWhy it is stored
Shop domain, name, contact email and currencyTo work in the right currency and to send the merchant notices, such as a failed balance charge or the monthly plan limit being reached.
Shopify access tokenThe store-level access Shopify issues to the app. Shipby does not store the names or email addresses of the staff who open it.
SettingsSender name, reply-to address, people to email per unit restocked, handling time, balance reminder days, locations, and the shop's own sending domain if one is set up.
Pre-order offersTheir names, products, dates, limits and stock counts.
Plan and monthly countThe shop's plan and the number of pre-orders taken in the month, to apply the plan.
Email logFor each email sent: the recipient address, the subject, and whether it was accepted for delivery.

The app does not store shoppers' names, phone numbers, postal addresses, dates of birth, payment card or bank details, or passwords.

What the app reads without keeping

To do its work, the app reads from the shop: products and variants, stock levels, locations, incoming inventory transfers and shipments, and the orders and fulfillment orders that contain pre-order items. From an order it keeps only what is listed above.

The app asks the merchant for permission to: read and update products and their purchase options; read inventory, locations, incoming transfers and shipments; read orders and fulfillments; hold and release fulfillment orders; and receive the back-in-stock form through the store's own address.

The app writes into the shop: the pre-order purchase option on chosen products, whether a sold-out variant can keep selling, a small piece of data on each variant that the product page reads, and holds on pre-order items. Shopify keeps that data under the merchant's own agreement with Shopify.

The emails it sends

  • To shoppers: the back-in-stock alert, with an unsubscribe link; "your pre-order is being prepared" when the stock arrives; a new date if an incoming-stock date moves; and, when the shop takes deposits, a reminder before the balance is charged.
  • To the merchant: a notice when a balance could not be collected, and when new pre-orders pause because the monthly plan limit is reached.

Emails to shoppers are sent in the shop's name, from Shipby's sending address or from the shop's own domain if the merchant sets one up. Replies go to the shop.

What we do not do

  • We do not sell personal data.
  • We do not use personal data for advertising or for profiling.
  • We do not send marketing to shoppers, and do not add sign-ups to any mailing list.
  • We do not make automated decisions about a person that have a legal effect. Pre-orders are released in the order they were placed.
  • The storefront part of the app sets no cookies and stores nothing in the shopper's browser.

Who the data is shared with

We use three service providers to run the app. Each handles data only to provide its service to us.

ProviderWhat it doesWhere
RenderRuns the app's server.United States (Ohio)
NeonStores the app's database.United States (Ohio)
ResendDelivers the app's emails.Ireland for Shipby's sending address; United States (Virginia) for a shop's own sending domain

Shopify is not our service provider in this sense: the merchant has its own agreement with Shopify, and the app works inside the merchant's Shopify store. Billing for the app is handled by Shopify.

We share personal data with nobody else, except when the law requires it.

Where the data is kept

The app's server and database are in the United States, emails pass through Ireland or the United States as shown above, and we are based in Algeria. Personal data may therefore be handled outside the country where the shopper or the merchant lives. A merchant who needs a data processing agreement for this can ask for one at support@nexuslogicsystems.com.

How long it is kept

DataHow long
Email log90 days.
Back-in-stock sign-upsDeleted 12 months after the alert was sent, or 12 months after the sign-up if the shopper unsubscribed. A sign-up still waiting is kept while the shop uses the app.
Buyer email on finished pre-orders and balancesRemoved 12 months after the pre-order was released, shipped or cancelled, or the balance was paid, failed or cancelled. The pre-order record itself stays for the merchant's accounts, without the email address.
Records of Shopify notices received30 days. They hold technical IDs only.
Everything stored for a shopUntil Shopify asks the app to erase the shop, 48 hours after uninstall.
Server logsKept by our hosting provider for a limited time, at most 30 days.
Database history kept for recoveryKept by our database provider for a limited time, at most 30 days.

Server logs record, for each request, its method, the address requested, the status and the time it took. They contain no email addresses. For storefront requests the address includes the parameters Shopify adds, which can include the ID of a logged-in customer, and an unsubscribe link includes its random code.

Requests from shoppers, and how erasure works

A shopper can ask the shop to see or to erase their data. The shop sends the request through Shopify, and Shopify passes it to the app.

A copy of the data

The merchant can download every back-in-stock sign-up from the app (Back in stock, Export CSV): email address, product, variant, status, marketing choice, language and dates. A buyer's pre-order details are part of the Shopify order, which the merchant already holds.

Erasing a shopper

When Shopify asks the app to erase a customer, the app:

  • deletes that email address's back-in-stock sign-ups;
  • removes the email address from that shopper's pre-orders and balances, and from the orders Shopify lists in the request;
  • deletes the email log entries sent to that address.

What remains is the pre-order record without the email address: order number, items, quantities and dates, which the merchant needs to ship what was paid for.

Unsubscribing

Every back-in-stock email has an unsubscribe link. It stops that alert at once, without an account.

Your rights

Depending on where you live, you may have the right to see, correct, erase or restrict the use of your personal data, to object to its use, to receive it in a portable form, and to complain to your data protection authority. Shoppers: please send your request to the shop. Merchants: write to support@nexuslogicsystems.com. We answer within 30 days.

When you uninstall

When a merchant uninstalls Shipby, the shop's access token is deleted at once and all scheduled work for that shop stops. The shop's records are kept for 48 hours, so that a reinstall can pick up where it left off. After 48 hours Shopify asks the app to erase the shop, and the app then deletes everything it stores for it: settings, offers, pre-orders, balances, back-in-stock sign-ups, the email log and the records of Shopify notices.

Every notice from Shopify is checked for Shopify's signature before the app acts on it.

Security

  • All traffic between Shopify, the app's server, the database and the email provider is encrypted in transit, and the database is encrypted at rest.
  • Requests from the Shopify admin are accepted only with a valid session token from Shopify. The back-in-stock form is accepted only through the store's own address, with Shopify's signature.
  • Product names and links in emails are read from Shopify, never taken from the shopper's browser.
  • Each shop's data is kept apart from every other shop's.
  • Only the developer has access to the systems, for support and maintenance.

No system is perfectly secure. If we learn of a breach that affects personal data handled for a merchant, we tell the merchant without undue delay.

Children

The app is a tool for businesses. It is not directed at children, and we do not knowingly collect data from children.

Changes to this policy

When we change this policy, we publish the new version on this page with a new effective date. If a change is important for merchants, we also tell them in the app or by email.

Contact

Nexus Logic Systems
Mostaganem, Algeria
support@nexuslogicsystems.com

This policy describes the Shopify app Shipby Preorder Back in Stock. It does not describe the website nexuslogicsystems.com.