Stripe's bracket-nested x-www-form-urlencoded encoder: objects → key[k], arrays → key[i], scalars appended; undefined/null are skipped. Handles the nested arrays checkout/subscription payloads need (line_items[0][price]).
x-www-form-urlencoded
key[k]
key[i]
line_items[0][price]
Stripe's bracket-nested
x-www-form-urlencodedencoder: objects →key[k], arrays →key[i], scalars appended; undefined/null are skipped. Handles the nested arrays checkout/subscription payloads need (line_items[0][price]).