| 400 | EXTPNO-OFFERS-0001 | Required fields are missing |
| 400 | EXTPNO-OFFERS-0002 | Request input validation failed |
| 400 | EXTPNO-OFFERS-CPOPOFFER-0005 | Request failed with unknown error |
| 400 | EXTPNO-OFFERS-CPOPOFFER-0006 | Unsupported Flow |
| 400 | EXTPNO-PRODUCT-AVAIL-0001 | Required fields are missing |
| 400 | EXTPNO-PRODUCT-AVAIL-0002 | Required fields are missing |
| 400 | EXTPNO-PRODUCT-AVAIL-0004 | User is not eligible to change plan or services |
| 400 | EXTPNO-PRODUCT-AVAIL-0005 | Account has pending order |
| 400 | EXTPNO-PRODUCT-AVAIL-POMMS-0001 | Request input validation failed |
| 400 | EXTPNO-PRODUCT-AVAIL-POMMS-0002 | Required fields are missing |
| 400 | EXTPNO-PRODUCT-AVAIL-POMMS-0003 | Internal server error occurred |
| 400 | EXTPNO-PRODUCT-AVAIL-POMMS-0004 | Change plan/service is not eligible |
| 400 | EXTPNO-PRODUCT-AVAIL-POMMS-0005 | Account has pending order |
| 500 | EXTPNO-OFFERS-CPOPOFFER-0001 | Request input validation failed |
| 500 | EXTPNO-OFFERS-CPOPOFFER-0002 | Downstream service error occurred while fetching product offerings |
| 500 | EXTPNO-OFFERS-CPOPOFFER-0004 | ATT Client not supported |
| 500 | EXTPNO-PRODUCT-AVAIL-0003 | Internal server error occurred |
| 500 | EXTPNO-UNKNOWN-001 | Unknown Error |