UTF-8 everywhere
All content sent to and received from the MyParcel API must be encoded in UTF-8. Declare the charset explicitly in your Content-Type header:
Content-Type: application/json;charset=utf-8
Why it matters
Recipient names, street names and cities often contain accented or non-Latin characters (é, ñ, ü, ø, …). Sending them in the wrong encoding produces garbled labels and undeliverable parcels. UTF-8 covers every character MyParcel supports, so set it once and you're safe.
Tips
Most HTTP clients default to UTF-8, but the charset is not always sent. Set it explicitly to avoid surprises.