Creates a custom-field definition. fieldName, fieldKey, and
displayLabel are required. fieldKey must be unique among active
definitions in the account; testing_framework is reserved (trimmed,
case-insensitive). The call checks account capacity and allows at most 30
options. A nonblank URL default must start with http:// or https://.
Test-case values support six field types, not TAG or URL. Do not put
credentials in default or option text.
Requires the CustomField:Create permission.
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Invalid payload, context, or ID; an ownership or lifecycle restriction; a capacity limit; or a TrueTest failure. The error body format varies.
Authentication or the required user context is missing or invalid. The error body format varies.
The caller lacks the operation permission or access to the resource. Headers do not grant access. The error body format varies.
Any other error. The error body format varies.