revert: remove testmode parameter from Mollie payment creation

Removed the testmode parameter as it was causing issues. Mollie will
automatically determine test/live mode based on the API key used.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xtr-dev/payload-billing",
-  "version": "0.1.23",
+  "version": "0.1.27",
   "description": "PayloadCMS plugin for billing and payment provider integrations with tracking and local testing",
   "license": "MIT",
   "type": "module",

src/providers/test.ts

@@ -424,7 +424,8 @@ export const testProvider = (testConfig: TestProviderConfig) => {
               setTimeout(() => {
                 processTestPayment(payload, session, pluginConfig).catch(async (error) => {
                   const logger = createContextLogger(payload, 'Test Provider')
-                  logger.error('Failed to process payment:', error)
+                  const errorMessage = error instanceof Error ? error.message : String(error)
+                  logger.error(`Failed to process payment: ${errorMessage}`)
 
                   // Ensure session status is updated consistently
                   session.status = 'failed'

src/providers/utils.ts

@@ -16,7 +16,7 @@ export const webhookResponses = {
     // Log error internally but don't expose details
     if (payload) {
       const logger = createContextLogger(payload, 'Webhook')
-      logger.error('Error:', message)
+      logger.error(`Error: ${message}`)
     } else {
       console.error('[Webhook] Error:', message)
     }
@@ -126,7 +126,12 @@ export async function updatePaymentStatus(
     }
   } catch (error) {
     const logger = createContextLogger(payload, 'Payment Update')
-    logger.error(`Failed to update payment ${paymentId}:`, error)
+    const errorMessage = error instanceof Error ? error.message : String(error)
+    const errorStack = error instanceof Error ? error.stack : undefined
+    logger.error(`Failed to update payment ${paymentId}: ${errorMessage}`)
+    if (errorStack) {
+      logger.error(`Stack trace: ${errorStack}`)
+    }
     return false
   }
 }
@@ -165,15 +170,22 @@ export function handleWebhookError(
   context?: string,
   payload?: Payload
 ): Response {
-  const message = error instanceof Error ? error.message : 'Unknown error'
+  const message = error instanceof Error ? error.message : String(error)
+  const stack = error instanceof Error ? error.stack : undefined
   const fullContext = context ? `${provider} Webhook - ${context}` : `${provider} Webhook`
 
   // Log detailed error internally for debugging
   if (payload) {
     const logger = createContextLogger(payload, fullContext)
-    logger.error('Error:', error)
+    logger.error(`Error: ${message}`)
+    if (stack) {
+      logger.error(`Stack trace: ${stack}`)
+    }
   } else {
-    console.error(`[${fullContext}] Error:`, error)
+    console.error(`[${fullContext}] Error: ${message}`)
+    if (stack) {
+      console.error(`[${fullContext}] Stack trace:`, stack)
+    }
   }
 
   // Return generic response to avoid information disclosure