installment_preferredDay {#installment-preferred-day}
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The preferred day of the month for initiating the installment payment. The value can range from 1 to 31.

Specifications {#installment-preferred-day_d108e21}
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* **Data Type:** String
* **Data Length:** 2

Mapping Information {#installment-preferred-day_d108e40}
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* **REST API Field:** installmentInformation.preferredDay
* **SCMP API Field:** auth_installment_preferred_day
* **Simple Order API Field:** installment_preferredDay