Fetches TikTok videos for a user. Returns up to 35 posts per page and includes a cursor for the next page. Costs 1 credit per page.
API key with 'ApiKey ' prefix (e.g., ApiKey ck_...)
TikTok username (e.g., "nike" or "@nike")
1 - 100Pagination cursor from previous response (0 for first page)
x >= 0SecUid from previous response (speeds up pagination by skipping profile lookup)