This method opts the seller in to an eBay seller program. Refer to the <a href="/api-docs/sell/account/overview.html#opt-in" target="_blank">Account API overview</a> for information about available eBay seller programs.<br /><br /><span class="tablenote"><b>Note:</b> It can take up to 24-hours for eBay to process your request to opt-in to a Seller Program. Use the <a href="/api-docs/sell/account/resources/program/methods/getOptedInPrograms" target="_blank">getOptedInPrograms</a> call to check the status of your request after the processing period has passed.</span>