> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mattildapayments.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Creating buyers & payment methods on import

For each unique buyer ID in the token import file, we will create a new buyer record in your instance. All fields that are passed in for the buyer will be linked to the respective fields of a [buyer record](/reference/buyers).

Similarly, for each payment method in the token import file, a new payment method record will be created in your instance. Additionally, if a buyer is present the payment method will be linked to the created buyer.
The buyer's `external_identifier` field will retain the value you passed in the import file we will produce a unique internal ID field as a part of the import process.

## Merchant Advice File

Once all tokens, buyer, and payment methods were imported we will provide you with a **Merchant Advice File** ([example](https://gist.githubusercontent.com/phillipgr4vy/f9ca91d6d4163842bd52e5fb1a3858d9/raw/b37d10c95215be9cf07d4afa82004abcfea202c0/merchant_advice_file.csv))
which will log the successful and unsuccessful imports of all resources as part of this process.

* For each row attempted, a corresponding log item will be shown with an audit reference tag
* The ID for each created buyer record created will be outputted
* The ID for each created payment method created will be outputted
* A list of failures and validation errors will be outputted