Regression in 4.8+ | no longer able to use camel case serialization

[rjgotten]

With the move to System.Text.Json in version 4.8+ it is no longer possible to configure requests for template models to be serialized with camel case conversion.

System.Text.Json does not have modifiable global default serializer settings like Newtonsoft.Json has and does not feature attribute-level control over the casing strategy. The only recourse to fix existing code is to painstakingly add hand-mapped [JsonProperty] remapping to camelcased names for each property on each transitively accessed model.

This is, frankly, an entirely shitty experience.
Update the library to support externally supplied serializer options, please.

[rjgotten]

For those seeking a workaround:

Serialize your structured mail template payloads to a JsonNode graph first.
That gives you full control over serialization settings, including converters, casings, etc.

Then pass that JsonNode graph to the PostMark library.
STJ supports direct serialization to JSON strings from the JsonNode type out of the box.