# 503: Calculation failed

Refers to Status Code:

[ERROR](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/status_codes/#error)

Possible Reason Codes:

[601: Merchant not eligible for product installment](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/601)

[650: The condition of amount is not passed. The amount is too low.](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/650)

[651: The condition of amount is not passed. The amount is too high.](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/651)

[652: CONFIGURATION_NOT_VALID](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/652)

[671: The condition of the last rate is not passed](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/671)

[688: Rate was too low for long runtime amount](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/688)

[689: Rate was too low for short runtime amount](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/689)

[695: Rate was too high to match minimum installment runtime](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/695)

[696: Rate was too low to match maximum allowed installment runtime](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/696)

[697: Rate or runtime did not match allowed runtime](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/697)

[698: Runtime was too long to match maximum allowed installment runtime](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/698)

[699: Runtime was too short to match minimum allowed installment runtime](/docs/developer/api_integration/payment_1.8/payment_api_documentation/responses/reason/699)