Title: Problem Registering External API Key with Custom Plugin
Last modified: August 18, 2025

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# Problem Registering External API Key with Custom Plugin

 *  [deenjames](https://wordpress.org/support/users/deenjames/)
 * (@deenjames)
 * [10 months ago](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/)
 * Hi everyone,
 * I’m working on integrating a third-party API into my WordPress site, but I’m 
   running into a problem with registering the API key properly.
 * Here’s what I’ve tried so far:
    - I created a small custom plugin where I added a settings page for entering
      the API key.
    - I’m using the WordPress Settings API (`register_setting`, `add_settings_section`,`
      add_settings_field`) to store the key in the database.
    - The key seems to save correctly in the options table, but when I make API 
      requests from the plugin, it looks like the key isn’t being recognized (the
      API returns “Invalid API key” error).
    - If I hard-code the API key directly in the function, it works fine — so I 
      think the issue is with how I’m registering or retrieving the saved option.
 * Here’s a snippet of how I’m calling it:
 *     ```wp-block-code
       $api_key = get_option('my_plugin_api_key');$response = wp_remote_get( "https://api.example.com/data?api_key=$api_key" );
       ```
   
 * Has anyone else faced this kind of issue with storing/retrieving API keys through
   the WordPress Settings API? Am I missing something in the registration step or
   sanitization callback?
 * Thanks in advance for any guidance!

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Moderator [threadi](https://wordpress.org/support/users/threadi/)
 * (@threadi)
 * [10 months ago](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/#post-18603298)
 * Take a close look at exactly what API key is being read. var_dump() is very helpful
   for debugging.
 * Example:
 *     ```wp-block-code
       $api_key = get_option('my_plugin_api_key');var_dump( $api_key );$response = wp_remote_get( "https://api.example.com/data?api_key=$api_key" );
       ```
   
 * It’s best to look at this in the WP CLI or in the browser source code, not in
   the browser itself, as it may already interpret the characters contained therein.
 * Also check carefully whether “my_plugin_api_key” is really the option_name of
   the setting with the key.
 *  [Mridul Goswami](https://wordpress.org/support/users/mridulgoswami/)
 * (@mridulgoswami)
 * [10 months ago](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/#post-18603543)
 * Hey there
 * I have had a similar problem in past. Can you also share your code where you 
   are actually storing the Option?
 * There is a possibility of wrong option name or shape.
 * Are you saving as a scalar (my_plugin_api_key) but reading an array (or vice-
   versa)?
 * If your field name is `name="my_plugin_api_key[api_key]"`in that case `get_option('
   my_plugin_api_key')` returns an array. In that case use `$opts = get_option('
   my_plugin_api_key')`; then `$api_key = $opts['api_key'] ?? '';`
 * I hope it helps you
 * Take care
 *  [Crypto30x](https://wordpress.org/support/users/crypto30x/)
 * (@crypto30x)
 * [10 months ago](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/#post-18605900)
 * Hi [@deenjames](https://wordpress.org/support/users/deenjames/),
 * Great work on setting up the settings page and getting your plugin to save the
   API key to the database! Since hard-coding the key works but retrieving it via`
   get_option()` doesn’t, the issue likely lies in how it’s being stored or retrieved.
   What to Check & Next Steps 1. **Debug What’s Actually Being Retrieved**
 * Dump the value you’re getting from the database to confirm what’s being returned:
 * `$api_key = get_option('my_plugin_api_key'); var_dump($api_key);`
 * Run this via WP-CLI or inspect the raw HTML output, not just in browser-rendered
   view — some characters may get stripped or transformed during rendering. This
   will help reveal if it’s empty, malformed, or nested within an array. [WordPress.org](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/)
   2. **Ensure Option Name Matches Exactly**
 * Even a tiny mismatch (e.g., a typo or difference in naming convention) between
   your `register_setting()` and `get_option()` can result in retrieving nothing
   or unknown values. Double-check that:
    - The option name in `register_setting()` matches the one in `get_option()`
    - There are no stray characters or whitespace in the name [WordPress.org](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/)
 * 3. **Check If Option Is Scalar or Array**
 * If your settings input field uses array naming syntax — for example, `<input 
   name="my_plugin_api_key[api_key]" ...>` — WordPress will save the option as an
   array, not a string. In that case, calling `get_option('my_plugin_api_key')` 
   returns an array, and you’d need to access the API key like this:
 * `$opts = get_option('my_plugin_api_key'); $api_key = isset($opts['api_key']) ?
   $opts['api_key'] : '';`
 * This setup mismatch could definitely cause the “Invalid API key” response you’re
   seeing. [WordPress.org](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/)
   Summary Table CheckpointWhat to DoRetrieve & inspect valueUse `var_dump()` outside
   of browser-rendered view to see raw dataOption name alignmentConfirm exact match
   between `register_setting()` and `get_option()`Data structure checkDetermine 
   if option is a string or array and handle accordingly
 * Once you’ve verified the retrieval and structure, test your API request again
   with the extracted value. If you’re still seeing issues, feel free to share the
   relevant snippet of your settings and retrieval code—I’d be happy to help debug
   further!

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Problem Registering External API Key with Custom Plugin’ is closed to
new replies.

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 4 replies
 * 4 participants
 * Last reply from: [Crypto30x](https://wordpress.org/support/users/crypto30x/)
 * Last activity: [10 months ago](https://wordpress.org/support/topic/problem-registering-external-api-key-with-custom-plugin/#post-18605900)
 * Status: not resolved

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