Komut satırı ya da postman üzerinden istek ürettiğinde de aynı hatayı alıyor musun?,
Ben aşağıdaki işlemleri sorunsuz gerçekleştirdim.
curl -X POST https://.../wp-json/wc/v3/products/attributes \
-u ck_b82f7acb76ffce14e29b5f75f410607746478862:cs_1661780e431e463144fe78c2a27494cd4116f838 \
-H "Content-Type: application/json" \
-d '{
"name": "Biçim",
"slug": "pa_bicim",
"type": "select",
"order_by": "menu_order",
"has_archives": true
}'
curl -X GET https://.../wp-json/wc/v3/products/attributes \
-u ck_b82f7acb76ffce14e29b5f75f410607746478862:cs_1661780e431e463144fe78c2a27494cd4116f838 \
-H "Content-Type: application/json"
curl -X POST https://.../wp-json/wc/v3/products/attributes/4/terms \
-u ck_b82f7acb76ffce14e29b5f75f410607746478862:cs_1661780e431e463144fe78c2a27494cd4116f838 \
-H "Content-Type: application/json" \
-d '{
"name": "XXS"
}' 
