For AI agents: visit https://docs.texter.id/llms.txt for an index of all pages formatted in Markdown and endpoints in OpenAPI. Append .md to any documentation page URL to get its markdown version.
POST /v1/precheck — removed. The endpoint now answers 410 Gone. Use the channel-routed endpoints instead: POST /v1/precheck/rcs, POST /v1/precheck/10dlc, POST /v1/precheck/tfn.
