bitFlyer Lightning API Playground GET /v1/getmarkets GET /v1/markets GET /v1/getmarkets/usa GET /v1/markets/usa GET /v1/getmarkets/eu GET /v1/markets/eu GET /v1/getboard product_code GET /v1/board product_code GET /v1/getticker product_code GET /v1/ticker product_code GET /v1/getexecutions product_code count before after GET /v1/executions product_code count before after GET /v1/getchats from_date