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Rey uses the App Store Connect API to upload builds — no Xcode, no manual signing. To authenticate, Rey needs four values from your Apple account. You only have to collect them once per team.
Configure iOS deployment — Credentials tab
These credentials give whoever holds them the ability to upload builds and manage your apps. Treat the .p8 file like a password — don’t commit it to git or share it in Slack.

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Apple Developer Team ID

A 10-character string that identifies your Apple Developer team.
1

Sign in to your Apple Developer account

Go to developer.apple.com/account.
2

Open Membership details

Scroll to the Membership details section.
3

Copy Team ID

Copy the 10-character string labelled Team ID and paste it into Rey.

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App Store Connect Issuer ID

A long UUID that identifies your organization inside App Store Connect. Every API key you create belongs to this issuer.
1

Open App Store Connect

Go to appstoreconnect.apple.com and sign in.
2

Go to Users and Access → Integrations

Click Users and Access in the top nav, then switch to the Integrations tab.
3

Copy Issuer ID

Near the top of the page you’ll see a long string with dashes labelled Issuer ID (format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx). Copy it into Rey.

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App Store Connect Key ID and private key

The Key ID and private key come together — you create them at the same time, and Apple only lets you download the private key once.
1

Stay on Users and Access → Integrations

Same page as the Issuer ID.
2

Create a new key

Click the + button to generate a new API key. Give it a name (e.g. “Rey deployment”) and grant it Admin access so it can create and upload builds.
3

Copy the Key ID

After the key is created, copy the 10-character string from the Key ID column into Rey.
4

Download the .p8 private key

Click Download API Key to save the .p8 file. Apple only allows this download once — if you lose it, you’ll need to revoke the key and create a new one.
5

Paste the private key into Rey

Open the .p8 file in any text editor, copy the entire contents (including the -----BEGIN PRIVATE KEY----- and -----END PRIVATE KEY----- lines), and paste it into the App Store Connect private key field. You can also drag the .p8 file directly onto the field.
Store the .p8 file in a secure location (like a password manager) as a backup. If your Rey workspace is ever wiped, you’ll want to be able to re-paste the key without generating a new one and updating every service that uses it.

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Rotating credentials

If a key is compromised or a team member leaves, revoke the affected key from Users and Access → Integrations in App Store Connect. Then create a new key and update the Key ID and private key fields in Rey — the Team ID and Issuer ID don’t change.