# MD for: https://www.mercadopago.com.ar/developers/en/docs/vault-migration/input-format.md

\# Input format for migrating vaults to tokenization The input file format must be a CSV separated by commas (","), and the file name must follow a naming convention defined by Mercado Pago, which will be communicated in due course. Below, you can see an example: \`\`\` Filler,external\_reference,customer\_email,Filler,Filler,card\_number,expiration\_month,expiration\_year,cardholder\_name,Filler ,217307543,test1@gmail.com,,,4356141052114191,11,25,Mary Meir, ,485342254,test2@gmail.com,,,4356141052114192,02,28,Jhon Doe, \`\`\` All fields are mandatory. Below are detailed descriptions of each field and their particularities: | Field | Description | Required or Optional | |---|---|---| | \`filler\` | These fields must be filled with a blank space, as they are necessary for our internal processing. | Required. | | \`external\_reference\` | Reference of the payer in the seller's system. | Required. | | \`customer\_email\` | Email of the paying user associated with the link. | Required. | | \`card\_number\` | Card number (PAN). | Required. | | \`expiration\_month\` | Expiration month of the card. | Required. | | \`expiration\_year\` | Expiration year of the card. | Required. | | \`cardholder\_name\` | Name that appears on the card. | Required. | > WARNING > > Important > > If you do not have the information for any field (for example: expiration date or cardholder name), fill in with placeholder data. ## Validations for the input file Below, we detail the validations that are performed during the processing of the input file: \* It is important to highlight that \*\*the limit to associate cards with a single email is 20 cards\*\*. If this limit is exceeded, the corresponding line will not be processed. \* The card expiration date must be a future date. \* Validation will be performed on the characters of the emails and the cardholder's name. \* The file name must conform to what was previously agreed upon.