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Banks can migrate existing customers to Peere in batches. Providers can do the same for merchants.

Migrating Customers (Banks)

Send a POST to /v1/bank/customers with an array of customer objects.
The response includes a batchId, a processing status, and a summary with counts for successful, failed, and duplicate records. For batches over a certain size, failures are returned as a downloadable CSV rather than inline. After migration, link customer devices using POST /v1/bank/customer/device/link to enable merchant discovery.

Migrating Merchants (Providers)

Send a POST to /v1/provider/merchants with an array of merchant objects. After creation, set appropriate trust levels for each merchant via PATCH /v1/provider/merchant/trust. Migrate in batches of 100 or fewer and add a short delay between requests to avoid rate limits.