Home > @infiniteobjects/shopify-data-manager > AdminTypes > CustomerMarketingOptInLevel
The possible values for the marketing subscription opt-in level enabled at the time the customer consented to receive marketing information.
The levels are defined by [the M3AAWG best practices guideline document](https://www.m3aawg.org/sites/maawg/files/news/M3AAWG_Senders_BCP_Ver3-2015-02.pdf).
Signature:
export declare enum CustomerMarketingOptInLevel
| Member | Value | Description |
|---|---|---|
| ConfirmedOptIn | "CONFIRMED_OPT_IN" |
After providing their information, the customer receives a confirmation and is required to perform a intermediate step before receiving marketing information. |
| SingleOptIn | "SINGLE_OPT_IN" |
After providing their information, the customer receives marketing information without any intermediate steps. |
| Unknown | "UNKNOWN" |
The customer receives marketing information but how they were opted in is unknown. |