This commit: - Replaces `createRequest`, `createPost`, and `submitForm` with a single `sendRequest` helper. - Adds `getRequest` and `postRequest` wrappers for clarity. - Removes redundant content type constants and parameters. - Updates envelope-related methods (`signEnvelope`, `rejectEnvelope`, `shareEnvelope`) to use the new request helpers. - Simplifies `redirect` and `redirRejected` functions.